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D( h )
h = 0
h = 0
h = 0
h in (-oo:0) U (0:+oo)
14/h = 7/20 // - 7/20
14/h-(7/20) = 0
14/h-7/20 = 0
14*h^-1 = 7/20 // : 14
h^-1 = 1/40
-1 < 0
1/(h^1) = 1/40 // * h^1
1 = 1/40*h^1 // : 1/40
40 = h^1
h = 40
h = 40
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