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X+5X/100=3990
We move all terms to the left:
X+5X/100-(3990)=0
We multiply all the terms by the denominator
X*100+5X-3990*100=0
We add all the numbers together, and all the variables
5X+X*100-399000=0
Wy multiply elements
5X+100X-399000=0
We add all the numbers together, and all the variables
105X-399000=0
We move all terms containing X to the left, all other terms to the right
105X=399000
X=399000/105
X=3800
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