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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
15 = 103/x // - 103/x
15-(103/x) = 0
15-103*x^-1 = 0
-103*x^-1 = -15 // : -103
x^-1 = 15/103
-1 < 0
1/(x^1) = 15/103 // * x^1
1 = 15/103*x^1 // : 15/103
103/15 = x^1
x = 103/15
x = 103/15
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