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(x+13)+(10x+13)+(2x-20)=180
We move all terms to the left:
(x+13)+(10x+13)+(2x-20)-(180)=0
We get rid of parentheses
x+10x+2x+13+13-20-180=0
We add all the numbers together, and all the variables
13x-174=0
We move all terms containing x to the left, all other terms to the right
13x=174
x=174/13
x=13+5/13
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