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(9x-18)+(3x+18)=360
We move all terms to the left:
(9x-18)+(3x+18)-(360)=0
We get rid of parentheses
9x+3x-18+18-360=0
We add all the numbers together, and all the variables
12x-360=0
We move all terms containing x to the left, all other terms to the right
12x=360
x=360/12
x=30
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