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D( h )
h = 0
h = 0
h = 0
h in (-oo:0) U (0:+oo)
603/h = 9 // - 9
603/h-9 = 0
603*h^-1 = 9 // : 603
h^-1 = 1/67
-1 < 0
1/(h^1) = 1/67 // * h^1
1 = 1/67*h^1 // : 1/67
67 = h^1
h = 67
h = 67
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