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X+X(2.5)=400000
We move all terms to the left:
X+X(2.5)-(400000)=0
We multiply parentheses
X+2.5X-400000=0
We add all the numbers together, and all the variables
3.5X-400000=0
We move all terms containing X to the left, all other terms to the right
3.5X=400000
X=400000/3.5
X=114285+2.5/3.5
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