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I want to box, as an answer, an equation of the align* environment. Not sure how to do it.

\begin{align*} (1+2i)z_2&=-11(2-i)\\ z_2&=\dfrac{11(i-2)}{1+2i}\\ z_2&=11i \end{align*}

I have tried \boxed{z_2&=11i}, but it failed.

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  • load mathtools-package and use \Aboxed{} Commented Mar 30, 2016 at 9:09
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    If your box needs to span more than one alignment point in the future, then this question may be of use: tex.stackexchange.com/questions/223511/… Commented Mar 30, 2016 at 10:04

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You can use the \Aboxed macro from the mathtools package to have a box around a single alignment point &, i.e. a single line in your case:

\documentclass[preview,border=10pt]{standalone} \usepackage{mathtools} \begin{document} \begin{align*} (1+2i)z_2&=-11(2-i)\\ z_2&=\dfrac{11(i-2)}{1+2i}\\ \Aboxed{z_2&=11i} \end{align*} \end{document}

Output

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    This is for an individual line in an alignment, as far as I know. Commented Mar 30, 2016 at 9:16
  • @Bernard Yes, I thought that was what OP was after, seeing as he tried \boxed{...}. The frame around the output is added later, I will change that to make it clearer :) Commented Mar 30, 2016 at 9:18

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