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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
-16/x = -15 // + 15
15-16/x = 0
-16*x^-1 = -15 // : -16
x^-1 = 15/16
-1 < 0
1/(x^1) = 15/16 // * x^1
1 = 15/16*x^1 // : 15/16
16/15 = x^1
x = 16/15
x = 16/15
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