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(x+56)+(2x-20)=180
We move all terms to the left:
(x+56)+(2x-20)-(180)=0
We get rid of parentheses
x+2x+56-20-180=0
We add all the numbers together, and all the variables
3x-144=0
We move all terms containing x to the left, all other terms to the right
3x=144
x=144/3
x=48
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