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