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(4x-15)+(12x+3)=180
We move all terms to the left:
(4x-15)+(12x+3)-(180)=0
We get rid of parentheses
4x+12x-15+3-180=0
We add all the numbers together, and all the variables
16x-192=0
We move all terms containing x to the left, all other terms to the right
16x=192
x=192/16
x=12
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