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(x+10)+(2x+70)=180
We move all terms to the left:
(x+10)+(2x+70)-(180)=0
We get rid of parentheses
x+2x+10+70-180=0
We add all the numbers together, and all the variables
3x-100=0
We move all terms containing x to the left, all other terms to the right
3x=100
x=100/3
x=33+1/3
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