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(2x+20)+(2x-4)=180
We move all terms to the left:
(2x+20)+(2x-4)-(180)=0
We get rid of parentheses
2x+2x+20-4-180=0
We add all the numbers together, and all the variables
4x-164=0
We move all terms containing x to the left, all other terms to the right
4x=164
x=164/4
x=41
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