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80+(x+55)=180
We move all terms to the left:
80+(x+55)-(180)=0
We add all the numbers together, and all the variables
(x+55)-100=0
We get rid of parentheses
x+55-100=0
We add all the numbers together, and all the variables
x-45=0
We move all terms containing x to the left, all other terms to the right
x=45
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