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(3x+12)+(5x-18)=180
We move all terms to the left:
(3x+12)+(5x-18)-(180)=0
We get rid of parentheses
3x+5x+12-18-180=0
We add all the numbers together, and all the variables
8x-186=0
We move all terms containing x to the left, all other terms to the right
8x=186
x=186/8
x=23+1/4
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