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x+40x/100=3500
We move all terms to the left:
x+40x/100-(3500)=0
We multiply all the terms by the denominator
x*100+40x-3500*100=0
We add all the numbers together, and all the variables
40x+x*100-350000=0
Wy multiply elements
40x+100x-350000=0
We add all the numbers together, and all the variables
140x-350000=0
We move all terms containing x to the left, all other terms to the right
140x=350000
x=350000/140
x=2500
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