making a single equation larger inside \begin{align} … \end{align}

Hello you wonderful TeX friends!

I have an issue making a single equation that bigger.

I'm restricted to use the align environment for my equations. I've used this answer to make inline math bigger, and I looked at this, but it's as the align environment is a bit tricky here. I would however like to stick to that. Any help or suggestions would be greatly appreciated.

code,

\documentclass{article}
\usepackage{amsmath}

\begin{document}

\begin{align}
2+2 = 4 \\
2=3 = 5 % I only want to make this single line bigger
\end{align}

% I'm aware I can something like this,

\begin{align}
2+2 = 4
\end{align}
\vspace{-15mm}
{\LARGE
\begin{align}
2+3 = 5
\end{align}
}

% but that enlarges the equation number,
% and I don't want that, along withing

\end{document}

• i'm not in a position to test anything, but amsart goes to some effort to keep the equation number the same size, regardless of the size applied to the content of the display. you may be able to steal the method from there. – barbara beeton Jul 30 '16 at 11:31
• Your LaTeX code is confusing. For instance, no use is made of alignment points inside the align environments, and the first align environment is missing a line-break directive between the rows. Is this deliberate? – Mico Jul 31 '16 at 11:33
• @Mico, thanks for the heads up, I've updated the code. – Eric Fail Jul 31 '16 at 12:17

Although the example code uses align there are no alignment points specified, which means that you can use a simpler setup such as gather

\documentclass{article}
\usepackage{amsmath}

\begin{document}

\begin{gather}
2+2 = 4 \\
% I only want to make this single line bigger
\mbox{\LARGE$\displaystyle2=3 = 5$}
\end{gather}

\end{document}

• Thanks! I am however restricted to use align. – Eric Fail Oct 31 '16 at 9:48
• @EricFail (you could just use the above with align) but it makes no sense, (sorry:-) saying you have to use align even when there is no alignment is like saying you have to use color to make black text or \textsubscript to make a superscript. Of course any of these things are possible but why???? – David Carlisle Oct 31 '16 at 9:54