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x=4+4y
x=8y
-2x+6y=-2
-2x=-2-6y
-2x=-8y
x=4
2x-5(y+1)=-5
2x-5y+5=-5
2x= -5-5+5y
2x=-5y
x= - 2,5
-x(y+2)=4
-xy-2x=4
-2x=4+xy
-2x-x=4+y
-x=4y
x=-4y
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