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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
15/x = 23 // - 23
15/x-23 = 0
15*x^-1 = 23 // : 15
x^-1 = 23/15
-1 < 0
1/(x^1) = 23/15 // * x^1
1 = 23/15*x^1 // : 23/15
15/23 = x^1
x = 15/23
x = 15/23
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