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(4x-12)+63+45=180
We move all terms to the left:
(4x-12)+63+45-(180)=0
We add all the numbers together, and all the variables
(4x-12)-72=0
We get rid of parentheses
4x-12-72=0
We add all the numbers together, and all the variables
4x-84=0
We move all terms containing x to the left, all other terms to the right
4x=84
x=84/4
x=21
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