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12(x-1)=6x+42
We move all terms to the left:
12(x-1)-(6x+42)=0
We multiply parentheses
12x-(6x+42)-12=0
We get rid of parentheses
12x-6x-42-12=0
We add all the numbers together, and all the variables
6x-54=0
We move all terms containing x to the left, all other terms to the right
6x=54
x=54/6
x=9
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