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6x-12-4x+4=4
2x=4+8
x=12/2
x=6
b)3(x+2)-4=2(x-7)
3x+6-4=2x-14
3x-2x=-14-2
x=-16
c)2=2(3x-5)-2(x+6)
2=6x-10-2x-12
2+22=4x
x=24/4
x=6
d)2(3-x)+55=139
6-2x+55=139
2x=139-61
x=78/2
x=39