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7y-x+2x-2=-25
7y+x=-23 (Ec. 1)
2y-x+7y-7=-32
9y-x=-25 (Ec. 2)
Por reducción. Eliminamos x:
7y+x=-23
9y-x=-25
16y=-48
y=-48/16
y=-3
Sustituimos y=-3 en Ec. 1 despejando x:
x=-23-7y
x=-23-7(-3)
x=-23+21
x=-2