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(6x+9)+(5x+12)+(12x+10)=180
We move all terms to the left:
(6x+9)+(5x+12)+(12x+10)-(180)=0
We get rid of parentheses
6x+5x+12x+9+12+10-180=0
We add all the numbers together, and all the variables
23x-149=0
We move all terms containing x to the left, all other terms to the right
23x=149
x=149/23
x=6+11/23
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