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X+(X-15.000)=109.000
We move all terms to the left:
X+(X-15.000)-(109.000)=0
We add all the numbers together, and all the variables
X+(X-15)-109=0
We get rid of parentheses
X+X-15-109=0
We add all the numbers together, and all the variables
2X-124=0
We move all terms containing X to the left, all other terms to the right
2X=124
X=124/2
X=62
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