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(X+10)+(4X+7)+(2X+9)=180
We move all terms to the left:
(X+10)+(4X+7)+(2X+9)-(180)=0
We get rid of parentheses
X+4X+2X+10+7+9-180=0
We add all the numbers together, and all the variables
7X-154=0
We move all terms containing X to the left, all other terms to the right
7X=154
X=154/7
X=22
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