\left( \begin{array} { l l } { x + y } & { m + n } \\ { x - y } & { m - n } \end{array} \right) = \left( \begin{array} { c c } { 3 } & { - 2 } \\ { 1 } & { 4 } \end{array} \right)
Solve for x, y, m, n
x=2
y=1
m=1
n=-3
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