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12+2y=6
2y=6-12
2y=-6/:2
y= -3
x=4
2y=6-3*4
x=4
2y= -6|:2
x=4
y= -3
x=4
12+2y = 6 /-6
6+2y= 0 /-2y
6= - 2y
y = -3
x = 4