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D( h )
h = 0
h = 0
h = 0
h in (-oo:0) U (0:+oo)
7/84 = 12/h // - 12/h
7/84-(12/h) = 0
7/84-12*h^-1 = 0
-12*h^-1 = -1/12 // : -12
h^-1 = 1/144
-1 < 0
1/(h^1) = 1/144 // * h^1
1 = 1/144*h^1 // : 1/144
144 = h^1
h = 144
h = 144
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