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D( h )
h = 0
h = 0
h = 0
h in (-oo:0) U (0:+oo)
55/35 = 33/h // - 33/h
55/35-(33/h) = 0
55/35-33*h^-1 = 0
-33*h^-1 = -11/7 // : -33
h^-1 = 1/21
-1 < 0
1/(h^1) = 1/21 // * h^1
1 = 1/21*h^1 // : 1/21
21 = h^1
h = 21
h = 21
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