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D( h )
h = 0
h = 0
h = 0
h in (-oo:0) U (0:+oo)
5/3 = 85/h // - 85/h
5/3-(85/h) = 0
5/3-85*h^-1 = 0
-85*h^-1 = -5/3 // : -85
h^-1 = 1/51
-1 < 0
1/(h^1) = 1/51 // * h^1
1 = 1/51*h^1 // : 1/51
51 = h^1
h = 51
h = 51
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