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(5x+20)+45=180
We move all terms to the left:
(5x+20)+45-(180)=0
We add all the numbers together, and all the variables
(5x+20)-135=0
We get rid of parentheses
5x+20-135=0
We add all the numbers together, and all the variables
5x-115=0
We move all terms containing x to the left, all other terms to the right
5x=115
x=115/5
x=23
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