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D( h )
h = 0
h = 0
h = 0
h in (-oo:0) U (0:+oo)
14/h = 2/5 // - 2/5
14/h-(2/5) = 0
14/h-2/5 = 0
14*h^-1 = 2/5 // : 14
h^-1 = 1/35
-1 < 0
1/(h^1) = 1/35 // * h^1
1 = 1/35*h^1 // : 1/35
35 = h^1
h = 35
h = 35
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