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X+X*28/100=90000
We move all terms to the left:
X+X*28/100-(90000)=0
We multiply all the terms by the denominator
X*100+X*28-90000*100=0
We add all the numbers together, and all the variables
X*100+X*28-9000000=0
Wy multiply elements
100X+28X-9000000=0
We add all the numbers together, and all the variables
128X-9000000=0
We move all terms containing X to the left, all other terms to the right
128X=9000000
X=9000000/128
X=70312+1/2
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