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X+1.5X=9
We move all terms to the left:
X+1.5X-(9)=0
We add all the numbers together, and all the variables
2.5X-9=0
We move all terms containing X to the left, all other terms to the right
2.5X=9
X=9/2.5
X=3+1/1.6666666666667
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