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D( h )
h = 0
h = 0
h = 0
h in (-oo:0) U (0:+oo)
15/h = 5/6 // - 5/6
15/h-(5/6) = 0
15/h-5/6 = 0
15*h^-1 = 5/6 // : 15
h^-1 = 1/18
-1 < 0
1/(h^1) = 1/18 // * h^1
1 = 1/18*h^1 // : 1/18
18 = h^1
h = 18
h = 18
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