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(12x-9)+135=180
We move all terms to the left:
(12x-9)+135-(180)=0
We add all the numbers together, and all the variables
(12x-9)-45=0
We get rid of parentheses
12x-9-45=0
We add all the numbers together, and all the variables
12x-54=0
We move all terms containing x to the left, all other terms to the right
12x=54
x=54/12
x=4+1/2
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