-4y=-20 |*(-1)
4y=20
y=5
4x+2y=-2=>4x+2*5=-2=>4x+10=-2=>4x=-12=>x=-3
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-4y=-20 |*(-1)
4y=20
y=5
4x+2y=-2=>4x+2*5=-2=>4x+10=-2=>4x=-12=>x=-3