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(100*x-20)/100 = 107 // - 107
(100*x-20)/100-107 = 0
(100*x-20)/100+(-107*100)/100 = 0
100*x-107*100-20 = 0
100*x-10720 = 0
(100*x-10720)/100 = 0
(100*x-10720)/100 = 0 // * 100
100*x-10720 = 0
100*x-10720 = 0 // + 10720
100*x = 10720 // : 100
x = 10720/100
x = 536/5
x = 536/5
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