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D( h )
h = 0
h = 0
h = 0
h in (-oo:0) U (0:+oo)
84/h = 6 // - 6
84/h-6 = 0
84*h^-1 = 6 // : 84
h^-1 = 1/14
-1 < 0
1/(h^1) = 1/14 // * h^1
1 = 1/14*h^1 // : 1/14
14 = h^1
h = 14
h = 14
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