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(x+3)+(7x+15)=180
We move all terms to the left:
(x+3)+(7x+15)-(180)=0
We get rid of parentheses
x+7x+3+15-180=0
We add all the numbers together, and all the variables
8x-162=0
We move all terms containing x to the left, all other terms to the right
8x=162
x=162/8
x=20+1/4
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