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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/9 = 18/x // - 18/x
5/9-(18/x) = 0
5/9-18*x^-1 = 0
-18*x^-1 = -5/9 // : -18
x^-1 = 5/162
-1 < 0
1/(x^1) = 5/162 // * x^1
1 = 5/162*x^1 // : 5/162
162/5 = x^1
x = 162/5
x = 162/5
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