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D( h )
h-6 = 0
h-6 = 0
h-6 = 0
h-6 = 0 // + 6
h = 6
h in (-oo:6) U (6:+oo)
5/(h-6) = 25 // - 25
5/(h-6)-25 = 0
5/(h-6)+(-25*(h-6))/(h-6) = 0
5-25*(h-6) = 0
155-25*h = 0
(155-25*h)/(h-6) = 0
(155-25*h)/(h-6) = 0 // * h-6
155-25*h = 0
155-25*h = 0 // - 155
-25*h = -155 // : -25
h = -155/(-25)
h = 31/5
h = 31/5
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