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(5x-12)+(3x+6)=180
We move all terms to the left:
(5x-12)+(3x+6)-(180)=0
We get rid of parentheses
5x+3x-12+6-180=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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