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(2x+20)+(2x-5)+(x+10)=180
We move all terms to the left:
(2x+20)+(2x-5)+(x+10)-(180)=0
We get rid of parentheses
2x+2x+x+20-5+10-180=0
We add all the numbers together, and all the variables
5x-155=0
We move all terms containing x to the left, all other terms to the right
5x=155
x=155/5
x=31
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