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D( h )
h = 0
h = 0
h = 0
h in (-oo:0) U (0:+oo)
9/h-47+6 = 8 // - 8
9/h-47-8+6 = 0
9*h^-1 = 49 // : 9
h^-1 = 49/9
-1 < 0
1/(h^1) = 49/9 // * h^1
1 = 49/9*h^1 // : 49/9
9/49 = h^1
h = 9/49
h = 9/49
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