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X+0.25X=508.75
We move all terms to the left:
X+0.25X-(508.75)=0
We add all the numbers together, and all the variables
1.25X-508.75=0
We move all terms containing X to the left, all other terms to the right
1.25X=508.75
X=508.75/1.25
X=407
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