I am trying to write more than one equation with numbering, but when using the \begin{align}
instead of \begin{equation}
the numbering disappears. Here are my equations with some split in two lines.
I have searched for similar questions to my question but I couldn't solve the issue.
\documentclass[12pt,twoside]{report}
\usepackage[utf8]{inputenc}
\usepackage{amssymb}
\usepackage{amsmath}
\usepackage{mathtools}
\usepackage{siunitx} %
\usepackage{textcomp}
\usepackage{hyperref}
\begin{document}
%-------------------this is part from chapter 3 ------
%objective eq1
\begin{equation}
\label{eq:3.1}
Min \quad \sum_{i=1}^{N} \sum_{s=1}^{C} \sum_{r=1}^{H} \sum_{k=1}^{G} \sum_{t=1}^{T} y_{isrk}^{t}
\end{equation}
Subjected to:
%eq2
\begin{equation}
\label{eq:3.2}
\vert{p_i}-\sum_{s=1}^{C} \sum_{r=1}^{H} \sum_{k=1}^{G} \sum_{t=1}^{T} v_{isrk}^{t}\vert{} \leq \delta,\qquad\forall{i}\in\{{1,\ldots,N}\} \end{equation}
%eq3
\begin{equation} \label{eq:3.3} \sum_{i=1}^{N} \sum_{s=1}^{C} \sum_{r=1}^{H} \sum_{k=1}^{G} v_{isrk}^{t} \leq{L},\qquad
\forall {t} \in {\{{1,\ldots,T}\}} \end{equation}
%eq4
\begin{equation}\label{eq:3.4} \sum_{i=1}^{N} \sum_{s=1}^{C} \sum_{r=1}^{H}v_{isrk}^{t} +\sum_{i=1}^{N} \sum_{s=1}^{C} \sum_{r=1}^{H}x_{isrk}^{t} \leq{1},\qquad \forall {t} \in {\{{1,\ldots,T}\}} \end{equation}
%eq5
\begin{equation} \label{eq:3.5}
\begin{multlined}
\sum_{i=1}^{N} x_{isrk}^{t} \leq \sum_{i=1}^{N}(u_{isrk}^{t}-u_{is(r+1)k}^{t}),\\ \qquad \forall {s} \in {\{{1,\ldots,C}\}},{r} \in {\{{1,\ldots,H-1}\}},
{k} \in {\{{1,\ldots,G}\}},{t} \in {\{{1,\ldots,T}\}}
\end{multlined}
\end{equation}
%eq6
\begin{equation}\label{eq:3.6}
\begin{multlined}
{\sum_{s^{'}=1 {,{s^{'}\neq s}}}^{N} \sum_{r=1}^{H} y_{i{s^{'}rk}}^{t}} \geq {\sum_{r=1}^{H}x_{isrk}^{t}},\\ \qquad \forall {i} \in {\{{1,\ldots,N}\}},{s} \in {\{{1,\ldots,C}\}},
{k} \in {\{{1,\ldots,G}\}},{t} \in {\{{1,\ldots,T}\}}
\end{multlined}
\end{equation}
%eq7
\begin{equation}\label{eq:3.7}
\begin{multlined}
\sum_{i=1}^{N} v_{isrk}^{t} + \sum_{i=1}^{N} y_{isrk}^{t} +\sum_{i=1}^{N} x_{isrk}^{t} \leq {1}, \\ \qquad \forall {s} \in {\{{1,\ldots,C}\}},{r} \in {\{{1,\ldots,H}\}},{k} \in {\{{1,\ldots,G}\}},{t} \in {\{{1,\ldots,T}\}}
\end{multlined}
\end{equation}
\end{document}
Thank you all for your comments, I have tried the following and It worked. Now the equations are aligned to the left side of the page.
\documentclass[12pt,twoside]{report}
\usepackage[utf8]{inputenc}
\usepackage{amssymb}
\usepackage{amsmath}
\usepackage{mathtools}
\usepackage{siunitx} %
\usepackage{textcomp}
\usepackage{hyperref}
\begin{document}
%-------------------this is part from chapter 3 ------
\begin{align}
%objective eq1
&\text{Objective:} \nonumber \\
& Min \quad \sum_{i=1}^{N} \sum_{s=1}^{C} \sum_{r=1}^{H} \sum_{k=1}^{G} \sum_{t=1}^{T} y_{isrk}^{t}\label{eq:3.1} \\
&\text{Subjected to} \nonumber \\
%eq2
&\vert{p_i}-\sum_{s=1}^{C} \sum_{r=1}^{H} \sum_{k=1}^{G} \sum_{t=1}^{T} v_{isrk}^{t}\vert{} \leq \delta,\qquad\forall{i}\in\{{1,\ldots,N}\}\label{eq:3.2}\\
&\begin{multlined}
\sum_{i=1}^{N} x_{isrk}^{t} \leq \sum_{i=1}^{N}(u_{isrk}^{t}-u_{is(r+1)k}^{t}),\\ \qquad \forall {s} \in {\{{1,\ldots,C}\}},{r} \in {\{{1,\ldots,H-1}\}},
{k} \in {\{{1,\ldots,G}\}},{t} \in {\{{1,\ldots,T}\}}
\end{multlined}\label{eq:3.3}\\%eq3
&\sum_{i=1}^{N} \sum_{s=1}^{C} \sum_{r=1}^{H}v_{isrk}^{t} +\sum_{i=1}^{N} \sum_{s=1}^{C} \sum_{r=1}^{H}x_{isrk}^{t} \leq{1},\qquad \forall {t} \in {\{{1,\ldots,T}\}}\label{eq:3.4}\\%eq4
&\begin{multlined}
\sum_{i=1}^{N} x_{isrk}^{t} \leq \sum_{i=1}^{N}(u_{isrk}^{t}-u_{is(r+1)k}^{t}),\\ \qquad \forall {s} \in {\{{1,\ldots,C}\}},{r} \in {\{{1,\ldots,H-1}\}},{k} \in {\{{1,\ldots,G}\}},{t} \in {\{{1,\ldots,T}\}}\end{multlined}\label{eq:3.5}\\%eq5
&\begin{multlined}
{\sum_{s^{'}=1 {,{s^{'}\neq s}}}^{N} \sum_{r=1}^{H} y_{i{s^{'}rk}}^{t}} \geq {\sum_{r=1}^{H}x_{isrk}^{t}},\\ \qquad \forall {i} \in {\{{1,\ldots,N}\}},{s} \in {\{{1,\ldots,C}\}},{k} \in {\{{1,\ldots,G}\}},{t} \in {\{{1,\ldots,T}\}}\end{multlined}\label{eq:3.6} \\ %eq6
&\begin{multlined}
\sum_{i=1}^{N} v_{isrk}^{t} + \sum_{i=1}^{N} y_{isrk}^{t} +\sum_{i=1}^{N} x_{isrk}^{t} \leq {1},\\ \qquad \forall {s} \in {\{{1,\ldots,C}\}},{r} \in {\{{1,\ldots,H}\}},{k} \in {\{{1,\ldots,G}\}},{t} \in {\{{1,\ldots,T}\}}\end{multlined}\label{eq:3.7}\\%eq7
& u_{isr1}^{1}=I_{isr},\qquad \forall {i} \in {\{{1,\ldots,N}\}}, {s} \in {\{{1,\ldots,C}\}},{r} \in {\{{1,\ldots,H}\}}\label{eq:3.8}\\
\end{align}
\end{document}
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. That may seem tedious to you, but think of the extra work it represents for TeX.SX users willing to give you a hand. Help them help you: remove that one hurdle between you and a solution to your problem.\begin{align} instead of \begin{equation} the numbering disappears
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in your example