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X+0.25X=321.9
We move all terms to the left:
X+0.25X-(321.9)=0
We add all the numbers together, and all the variables
1.25X-321.9=0
We move all terms containing X to the left, all other terms to the right
1.25X=321.9
X=321.9/1.25
X=257+0.65/1.25
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