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(x+40)+(4x-5)=180
We move all terms to the left:
(x+40)+(4x-5)-(180)=0
We get rid of parentheses
x+4x+40-5-180=0
We add all the numbers together, and all the variables
5x-145=0
We move all terms containing x to the left, all other terms to the right
5x=145
x=145/5
x=29
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