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(x+54)+(5x-12)=180
We move all terms to the left:
(x+54)+(5x-12)-(180)=0
We get rid of parentheses
x+5x+54-12-180=0
We add all the numbers together, and all the variables
6x-138=0
We move all terms containing x to the left, all other terms to the right
6x=138
x=138/6
x=23
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