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25 = (39000-x)/y // - (39000-x)/y
25-((39000-x)/y) = 0
(-1*(39000-x))/y+25 = 0
(-1*(39000-x))/y+(25*y)/y = 0
25*y-1*(39000-x) = 0
x+25*y-39000 = 0
(x+25*y-39000)/y = 0
(x+25*y-39000)/y = 0 // * y
x+25*y-39000 = 0
x+25*y-39000 = 0 // - 25*y-39000
x = -(25*y-39000)
x = 39000-(25*y)
x = 39000-(25*y)
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