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(x+15)+(4x-45)=40
We move all terms to the left:
(x+15)+(4x-45)-(40)=0
We get rid of parentheses
x+4x+15-45-40=0
We add all the numbers together, and all the variables
5x-70=0
We move all terms containing x to the left, all other terms to the right
5x=70
x=70/5
x=14
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