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(100-x-50)/100 = 0.25 // - 0.25
(100-x-50)/100-0.25 = 0
(50-x)/100-0.25 = 0
(50-x)/100+(-0.25*100)/100 = 0
50-x-0.25*100 = 0
25-x = 0
(25-x)/100 = 0
(25-x)/100 = 0 // * 100
25-x = 0
25-x = 0 // - 25
-x = -25 // * -1
x = 25
x = 25
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