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(8x+12)=140
We move all terms to the left:
(8x+12)-(140)=0
We get rid of parentheses
8x+12-140=0
We add all the numbers together, and all the variables
8x-128=0
We move all terms containing x to the left, all other terms to the right
8x=128
x=128/8
x=16
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