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X+0.08X=400
We move all terms to the left:
X+0.08X-(400)=0
We add all the numbers together, and all the variables
1.08X-400=0
We move all terms containing X to the left, all other terms to the right
1.08X=400
X=400/1.08
X=370+0.39999999999998/1.08
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