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X+(6X+10)+(X+12)=180
We move all terms to the left:
X+(6X+10)+(X+12)-(180)=0
We get rid of parentheses
X+6X+X+10+12-180=0
We add all the numbers together, and all the variables
8X-158=0
We move all terms containing X to the left, all other terms to the right
8X=158
X=158/8
X=19+3/4
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