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6x-4y=12
6x=12+4y
x=12+4ysobre 6
x-2y=6
x=6+2y
x=x
12+4ysobre6=6+2y
12+4y=36+12y
4y-12y=36-12
-8y=24
y=24sobre-8
y=-3
x-2y=6
x-2(-3)=6
x+6=6
x=6-6
x=0