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60x/100-20x/100=120
We move all terms to the left:
60x/100-20x/100-(120)=0
We multiply all the terms by the denominator
60x-20x-120*100=0
We add all the numbers together, and all the variables
40x-12000=0
We move all terms containing x to the left, all other terms to the right
40x=12000
x=12000/40
x=300
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