Question
\left(\begin{array}{ll} 1 & 2 \\ 3 & 4 \end{array}\right)+\left(\begin{array}{ll} w & x \\ y & z \end{array}\right)=\left(\begin{array}{cc} z-2 & 2 y-6 \\ 2 w & 2 x \end{array}\right) w + x + y+ z =?
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