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(12x-40)=8
We move all terms to the left:
(12x-40)-(8)=0
We get rid of parentheses
12x-40-8=0
We add all the numbers together, and all the variables
12x-48=0
We move all terms containing x to the left, all other terms to the right
12x=48
x=48/12
x=4
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