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(3x-12)+(4x-15)=29
We move all terms to the left:
(3x-12)+(4x-15)-(29)=0
We get rid of parentheses
3x+4x-12-15-29=0
We add all the numbers together, and all the variables
7x-56=0
We move all terms containing x to the left, all other terms to the right
7x=56
x=56/7
x=8
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