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(20-(75*x))/25 = (-25*x)/75 // - (-25*x)/75
(20-(75*x))/25-((-25*x)/75) = 0
(20-75*x)/25+(1/3)*x = 0
(20-75*x)/25+x/3 = 0
(3*(20-75*x))/(3*25)+(25*x)/(3*25) = 0
3*(20-75*x)+25*x = 0
60-200*x = 0
(60-200*x)/(3*25) = 0
(60-200*x)/(3*25) = 0 // * 3*25
60-200*x = 0
60-200*x = 0 // - 60
-200*x = -60 // : -200
x = -60/(-200)
x = 3/10
x = 3/10
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