${(1/2(x-y)=x+y),(3x=2(x-y)):}$

$\{(1/2(x-y)=x+y),(3x=2(x-y)):}$


$\{(1/2(x-y)=x+y),(3x=2(x-y)):}$; $\{(1/2x-1/2y=x+y),(3x=2x-2y):}$;
$\{(x-y=2x+2y),(x=-2y):}$; $\{(-x-3y=0),(x=-2y):}$; $\{(2y-3y=0),(x=-2y):}$;
$\{(-y=0),(x=0):}$; $\{(y=0),(x=0):}$.

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