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12x-76=6x+140
We move all terms to the left:
12x-76-(6x+140)=0
We get rid of parentheses
12x-6x-140-76=0
We add all the numbers together, and all the variables
6x-216=0
We move all terms containing x to the left, all other terms to the right
6x=216
x=216/6
x=36
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