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D( h )
h = 0
h = 0
h = 0
h in (-oo:0) U (0:+oo)
(3*h)/25+(15*h)/h = 0
3/25*h+15 = 0 // - 15
3/25*h = -15 // : 3/25
h = -15/3/25
h = -125
h = -125
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