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X+(3X)+(X+30)=180
We move all terms to the left:
X+(3X)+(X+30)-(180)=0
We add all the numbers together, and all the variables
4X+(X+30)-180=0
We get rid of parentheses
4X+X+30-180=0
We add all the numbers together, and all the variables
5X-150=0
We move all terms containing X to the left, all other terms to the right
5X=150
X=150/5
X=30
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