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(x+40)+(2x+5)=180
We move all terms to the left:
(x+40)+(2x+5)-(180)=0
We get rid of parentheses
x+2x+40+5-180=0
We add all the numbers together, and all the variables
3x-135=0
We move all terms containing x to the left, all other terms to the right
3x=135
x=135/3
x=45
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