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D( i )
50-(25*i) = 0
50-(25*i) = 0
50-(25*i) = 0
50-25*i = 0
50-25*i = 0 // - 50
-25*i = -50 // : -25
i = -50/(-25)
i = 2
i in (-oo:2) U (2:+oo)
(25*50*i)/(50-(25*i)) = 0
(25*50*i)/(50-25*i) = 0
(1250*i)/(50-25*i) = 0
1250*i = 0 // : 1250
i = 0
i = 0
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