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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(5*x-9)/x = 8*y // - 8*y
(5*x-9)/x-(8*y) = 0
(5*x-9)/x-8*y = 0
(5*x-9)/x+(-8*x*y)/x = 0
5*x-8*x*y-9 = 0
5*x-8*x*y-9 = 0
-8*x*y-9 = 0 // + 9
-8*x*y = 9 // : -8*y
x = 9/(-8*y)
x+9/8*y^-1 = 0
(x+9/8*y^-1)/x = 0
(x+9/8*y^-1)/x = 0 // * x
x+9/8*y^-1 = 0
x+9/8*y^-1 = 0 // - 9/8*y^-1
x = -(9/8*y^-1)
x = -9/8*y^-1
x = -9/8*y^-1
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