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(2x-10)+(2x+20)+x=180
We move all terms to the left:
(2x-10)+(2x+20)+x-(180)=0
We add all the numbers together, and all the variables
x+(2x-10)+(2x+20)-180=0
We get rid of parentheses
x+2x+2x-10+20-180=0
We add all the numbers together, and all the variables
5x-170=0
We move all terms containing x to the left, all other terms to the right
5x=170
x=170/5
x=34
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