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X+(X+60)+2X=900
We move all terms to the left:
X+(X+60)+2X-(900)=0
We add all the numbers together, and all the variables
3X+(X+60)-900=0
We get rid of parentheses
3X+X+60-900=0
We add all the numbers together, and all the variables
4X-840=0
We move all terms containing X to the left, all other terms to the right
4X=840
X=840/4
X=210
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