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D( h )
h = 0
h = 0
h = 0
h in (-oo:0) U (0:+oo)
7/6 = 3/h // - 3/h
7/6-(3/h) = 0
7/6-3*h^-1 = 0
-3*h^-1 = -7/6 // : -3
h^-1 = 7/18
-1 < 0
1/(h^1) = 7/18 // * h^1
1 = 7/18*h^1 // : 7/18
18/7 = h^1
h = 18/7
h = 18/7
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