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D( h )
h = 0
h = 0
h = 0
h in (-oo:0) U (0:+oo)
1/8 = 7/h // - 7/h
1/8-(7/h) = 0
1/8-7*h^-1 = 0
-7*h^-1 = -1/8 // : -7
h^-1 = 1/56
-1 < 0
1/(h^1) = 1/56 // * h^1
1 = 1/56*h^1 // : 1/56
56 = h^1
h = 56
h = 56
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