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X+2.5X=80
We move all terms to the left:
X+2.5X-(80)=0
We add all the numbers together, and all the variables
3.5X-80=0
We move all terms containing X to the left, all other terms to the right
3.5X=80
X=80/3.5
X=22+1/1.1666666666667
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