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(2x+8)+(4x-20)=180
We move all terms to the left:
(2x+8)+(4x-20)-(180)=0
We get rid of parentheses
2x+4x+8-20-180=0
We add all the numbers together, and all the variables
6x-192=0
We move all terms containing x to the left, all other terms to the right
6x=192
x=192/6
x=32
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