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(3x+18)+(4x+15)=180
We move all terms to the left:
(3x+18)+(4x+15)-(180)=0
We get rid of parentheses
3x+4x+18+15-180=0
We add all the numbers together, and all the variables
7x-147=0
We move all terms containing x to the left, all other terms to the right
7x=147
x=147/7
x=21
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