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25*y = (1000-(20*x))/25 // - (1000-(20*x))/25
25*y-((1000-(20*x))/25) = 0
25*y-((1000-20*x)/25) = 0
(-1*(1000-20*x))/25+25*y = 0
(-1*(1000-20*x))/25+(25*25*y)/25 = 0
25*25*y-1*(1000-20*x) = 0
20*x+625*y-1000 = 0
(20*x+625*y-1000)/25 = 0
(20*x+625*y-1000)/25 = 0 // * 25
20*x+625*y-1000 = 0
20*x+625*y-1000 = 0 // - 625*y-1000
20*x = -(625*y-1000) // : 20
x = (-(625*y-1000))/20
x = (1000-(625*y))/20
x = (1000-(625*y))/20
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