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How to display formulas inside a box or frame in Latex ? \boxed

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To display formula inside a box or frame, we must use \boxed
function of amsmath package:

\usepackage{amsmath}

For exemple:

$$\boxed{u=1}$$
$$
\begin{equation}
\boxed{
\begin{array}{rcl}
x + -y + z -t & = & 0 \\
2x + 2y + 2z +3t & = & 0
\end{array}
}
$$

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