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12x-(4x-2)=66
We move all terms to the left:
12x-(4x-2)-(66)=0
We get rid of parentheses
12x-4x+2-66=0
We add all the numbers together, and all the variables
8x-64=0
We move all terms containing x to the left, all other terms to the right
8x=64
x=64/8
x=8
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