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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
(100-y)/y = 24 // - 24
(100-y)/y-24 = 0
(100-y)/y+(-24*y)/y = 0
100-y-24*y = 0
100-25*y = 0
(100-25*y)/y = 0
(100-25*y)/y = 0 // * y
100-25*y = 0
100-25*y = 0 // - 100
-25*y = -100 // : -25
y = -100/(-25)
y = 4
y = 4
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