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(x+5)+(x+15)+(10x-20)=180
We move all terms to the left:
(x+5)+(x+15)+(10x-20)-(180)=0
We get rid of parentheses
x+x+10x+5+15-20-180=0
We add all the numbers together, and all the variables
12x-180=0
We move all terms containing x to the left, all other terms to the right
12x=180
x=180/12
x=15
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