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(8x+12)+x=180
We move all terms to the left:
(8x+12)+x-(180)=0
We add all the numbers together, and all the variables
x+(8x+12)-180=0
We get rid of parentheses
x+8x+12-180=0
We add all the numbers together, and all the variables
9x-168=0
We move all terms containing x to the left, all other terms to the right
9x=168
x=168/9
x=18+2/3
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