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(x+10)+(2x-30)=180
We move all terms to the left:
(x+10)+(2x-30)-(180)=0
We get rid of parentheses
x+2x+10-30-180=0
We add all the numbers together, and all the variables
3x-200=0
We move all terms containing x to the left, all other terms to the right
3x=200
x=200/3
x=66+2/3
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