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(x+12)+6x+2(x+12)=180
We move all terms to the left:
(x+12)+6x+2(x+12)-(180)=0
We add all the numbers together, and all the variables
6x+(x+12)+2(x+12)-180=0
We multiply parentheses
6x+(x+12)+2x+24-180=0
We get rid of parentheses
6x+x+2x+12+24-180=0
We add all the numbers together, and all the variables
9x-144=0
We move all terms containing x to the left, all other terms to the right
9x=144
x=144/9
x=16
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