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12x=4x-40
We move all terms to the left:
12x-(4x-40)=0
We get rid of parentheses
12x-4x+40=0
We add all the numbers together, and all the variables
8x+40=0
We move all terms containing x to the left, all other terms to the right
8x=-40
x=-40/8
x=-5
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