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X+2X+(X+5)=100
We move all terms to the left:
X+2X+(X+5)-(100)=0
We add all the numbers together, and all the variables
3X+(X+5)-100=0
We get rid of parentheses
3X+X+5-100=0
We add all the numbers together, and all the variables
4X-95=0
We move all terms containing X to the left, all other terms to the right
4X=95
X=95/4
X=23+3/4
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