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(x+40)+(x+40)=180
We move all terms to the left:
(x+40)+(x+40)-(180)=0
We get rid of parentheses
x+x+40+40-180=0
We add all the numbers together, and all the variables
2x-100=0
We move all terms containing x to the left, all other terms to the right
2x=100
x=100/2
x=50
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