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X+.4X=130000
We move all terms to the left:
X+.4X-(130000)=0
We add all the numbers together, and all the variables
1.4X-130000=0
We move all terms containing X to the left, all other terms to the right
1.4X=130000
X=130000/1.4
X=92857+0.20000000001164/1.4
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