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120=12x-12
We move all terms to the left:
120-(12x-12)=0
We get rid of parentheses
-12x+12+120=0
We add all the numbers together, and all the variables
-12x+132=0
We move all terms containing x to the left, all other terms to the right
-12x=-132
x=-132/-12
x=+11
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