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(3x-18)+(12x-27)=180
We move all terms to the left:
(3x-18)+(12x-27)-(180)=0
We get rid of parentheses
3x+12x-18-27-180=0
We add all the numbers together, and all the variables
15x-225=0
We move all terms containing x to the left, all other terms to the right
15x=225
x=225/15
x=15
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