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(11x-3)+(7x+5)+(13x-8)=180
We move all terms to the left:
(11x-3)+(7x+5)+(13x-8)-(180)=0
We get rid of parentheses
11x+7x+13x-3+5-8-180=0
We add all the numbers together, and all the variables
31x-186=0
We move all terms containing x to the left, all other terms to the right
31x=186
x=186/31
x=6
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