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D( h )
h = 0
h = 0
h = 0
h in (-oo:0) U (0:+oo)
(8-(5*h))/h = 0
(8-5*h)/h = 0
8-5*h = 0 // - 8
-5*h = -8 // : -5
h = -8/(-5)
h = 8/5
h = 8/5
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