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(3x+9)+(3x-15)=180
We move all terms to the left:
(3x+9)+(3x-15)-(180)=0
We get rid of parentheses
3x+3x+9-15-180=0
We add all the numbers together, and all the variables
6x-186=0
We move all terms containing x to the left, all other terms to the right
6x=186
x=186/6
x=31
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