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