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(2x-10)+(2x+30)=180
We move all terms to the left:
(2x-10)+(2x+30)-(180)=0
We get rid of parentheses
2x+2x-10+30-180=0
We add all the numbers together, and all the variables
4x-160=0
We move all terms containing x to the left, all other terms to the right
4x=160
x=160/4
x=40
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