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D( i )
1-(3*i) = 0
1-(3*i) = 0
1-(3*i) = 0
1-3*i = 0
1-3*i = 0 // - 1
-3*i = -1 // : -3
i = -1/(-3)
i = 1/3
i in (-oo:1/3) U (1/3:+oo)
(20*i)/(1-(3*i)) = 0
(20*i)/(1-3*i) = 0
20*i = 0 // : 20
i = 0
i = 0
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