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(2x+45)+55=180
We move all terms to the left:
(2x+45)+55-(180)=0
We add all the numbers together, and all the variables
(2x+45)-125=0
We get rid of parentheses
2x+45-125=0
We add all the numbers together, and all the variables
2x-80=0
We move all terms containing x to the left, all other terms to the right
2x=80
x=80/2
x=40
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