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X-0.15X=331.5
We move all terms to the left:
X-0.15X-(331.5)=0
We add all the numbers together, and all the variables
0.85X-331.5=0
We move all terms containing X to the left, all other terms to the right
0.85X=331.5
X=331.5/0.85
X=390
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