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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(85/10)*y = 9/x // - 9/x
(85/10)*y-(9/x) = 0
(85/10)*y-9*x^-1 = 0
-9*x^-1 = -(17/2*y) // : -9
x^-1 = 17/18*y
-1 < 0
1/(x^1) = 17/18*y // * x^1
1 = 17/18*x^1*y // : 17/18*y
18/17*y^-1 = x^1
x = 18/17*y^-1
x = 18/17*y^-1
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