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D( h )
h = 0
h = 0
h = 0
h in (-oo:0) U (0:+oo)
364/h = 7 // - 7
364/h-7 = 0
364*h^-1 = 7 // : 364
h^-1 = 1/52
-1 < 0
1/(h^1) = 1/52 // * h^1
1 = 1/52*h^1 // : 1/52
52 = h^1
h = 52
h = 52
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