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2x-4(3x-2)=-12
2x-12x+8=-12
-10x=-12-8
-10x=-20
x=2
y=3x-2 , y=3*2-2=6-2=4
b) 8x-y=8
2x-1/4y=-2 /* (-4)
8x-y=8
-8x+y=8
Równoważą się, czyli x∈R, y∈R