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(4x-8)+(8x-39)=61
We move all terms to the left:
(4x-8)+(8x-39)-(61)=0
We get rid of parentheses
4x+8x-8-39-61=0
We add all the numbers together, and all the variables
12x-108=0
We move all terms containing x to the left, all other terms to the right
12x=108
x=108/12
x=9
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