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12x-139=-8x+181
We move all terms to the left:
12x-139-(-8x+181)=0
We get rid of parentheses
12x+8x-181-139=0
We add all the numbers together, and all the variables
20x-320=0
We move all terms containing x to the left, all other terms to the right
20x=320
x=320/20
x=16
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