I got an align-environment starting off with a sentence. After this introductory sentence I want to have the equations centered in the page, each equal-sign under each other. Following MEW:
\documentclass{article}
\usepackage{amsmath,bm}
\usepackage{mathtools}
\begin{document}
\begin{align} \label{eq:gen_alpha}
\begin{aligned}
\text{Given } \mathbf{d}_{n},\mathbf{v}_{n} \text{ and } \mathbf{a}_{n} \text{. Find } \mathbf{d}_{n+1},\mathbf{v}_{n+1}, \mathbf{a}_{n+1},\mathbf{d}_{n+\alpha_{f}},\mathbf{v}_{n+\alpha_{f}}, \mathbf{a}_{n+\alpha_{m}} \text {and } \bm{\Phi}_{n+1} \text{ so that:} \\
\mathbf{R}^{u}\left(\mathbf{d}_{n+\alpha_{f}},\mathbf{v}_{n+\alpha_{f}},\mathbf{a}_{n+\alpha_{m}},\mathbf{\Phi}_{n+1}\right) &= 0, \\
\mathbf{R}^{c}\left(\mathbf{d}_{n+\alpha_{f}},\mathbf{\Phi}_{n+1}\right) &= 0, \\
\mathbf{d}_{n+\alpha_{f}} &= \mathbf{d}_{n}+\alpha_{f}\left(\mathbf{d}_{n+1}-\mathbf{d}_{n}\right), \\
\mathbf{v}_{n+\alpha_{f}} &= \mathbf{v}_{n}+\alpha_{f}\left(\mathbf{v}_{n+1}-\mathbf{v}_{n}\right), \\
\mathbf{a}_{n+\alpha_{m}} &= \mathbf{a}_{n}+\alpha_{m}\left(\mathbf{a}_{n+1}-\mathbf{a}_{n}\right), \\
\mathbf{v}_{n+1} &= \mathbf{v}_{n}+\Delta t\left(\left(1-\gamma\right)\mathbf{a}_{n}+\gamma\mathbf{a}_{n+1}\right), \\
\mathbf{d}_{n+\alpha f} &= \mathbf{d}_{n}+\alpha_{f}\left(\mathbf{d}_{n+1}-\mathbf{d}_{n}\right).
\end{aligned}
\end{align}
\end{document}
The text alignment is great, only all the equations should be centered.
Thanks for help :)
\intertext{sentence}
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