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(X+18)+4X+X=180
We move all terms to the left:
(X+18)+4X+X-(180)=0
We add all the numbers together, and all the variables
5X+(X+18)-180=0
We get rid of parentheses
5X+X+18-180=0
We add all the numbers together, and all the variables
6X-162=0
We move all terms containing X to the left, all other terms to the right
6X=162
X=162/6
X=27
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