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x+x+2.5x-9+1.5x=99
We move all terms to the left:
x+x+2.5x-9+1.5x-(99)=0
We add all the numbers together, and all the variables
6x-108=0
We move all terms containing x to the left, all other terms to the right
6x=108
x=108/6
x=18
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