Find the matrix \( X \) if \( X+Y=\left[\begin{array}{cc}1 & -2 \\ ...

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Find the matrix \( X \) if \( X+Y=\left[\begin{array}{cc}1 & -2 \\ 3 & 4\end{array}\right] \) and
\( \mathrm{P} \)
\[
X-Y=\left[\begin{array}{cc}
7 & 8 \\
9 & -2
\end{array}\right]
\]
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