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D( h )
h = 0
h = 0
h = 0
h in (-oo:0) U (0:+oo)
8/7 = 5/h // - 5/h
8/7-(5/h) = 0
8/7-5*h^-1 = 0
-5*h^-1 = -8/7 // : -5
h^-1 = 8/35
-1 < 0
1/(h^1) = 8/35 // * h^1
1 = 8/35*h^1 // : 8/35
35/8 = h^1
h = 35/8
h = 35/8
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