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(5x)+(7x-40)=180
We move all terms to the left:
(5x)+(7x-40)-(180)=0
We get rid of parentheses
5x+7x-40-180=0
We add all the numbers together, and all the variables
12x-220=0
We move all terms containing x to the left, all other terms to the right
12x=220
x=220/12
x=18+1/3
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