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(x+20)+(x+17)+(7x-4)=180
We move all terms to the left:
(x+20)+(x+17)+(7x-4)-(180)=0
We get rid of parentheses
x+x+7x+20+17-4-180=0
We add all the numbers together, and all the variables
9x-147=0
We move all terms containing x to the left, all other terms to the right
9x=147
x=147/9
x=16+1/3
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