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D( x )
x-5 = 0
x-5 = 0
x-5 = 0
x-5 = 0 // + 5
x = 5
x in (-oo:5) U (5:+oo)
4/(x-5)-(3/y) = 0
4/(x-5)-3*y^-1 = 0
4/(x-5)-3/y = 0
(4*y)/(y*(x-5))+(-3*(x-5))/(y*(x-5)) = 0
4*y-3*(x-5) = 0
4*y-3*x+15 = 0
(4*y-3*x+15)/(y*(x-5)) = 0
(4*y-3*x+15)/(y*(x-5)) = 0 // * y*(x-5)
4*y-3*x+15 = 0
4*y-3*x+15 = 0 // - 4*y+15
-3*x = -(4*y+15) // : -3
x = (-(4*y+15))/(-3)
x = (4*y+15)/3
x = (4*y+15)/3
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