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15x-29=12x+7
We move all terms to the left:
15x-29-(12x+7)=0
We get rid of parentheses
15x-12x-7-29=0
We add all the numbers together, and all the variables
3x-36=0
We move all terms containing x to the left, all other terms to the right
3x=36
x=36/3
x=12
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