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D( i )
1-(5*i) = 0
1-(5*i) = 0
1-(5*i) = 0
1-5*i = 0
1-5*i = 0 // - 1
-5*i = -1 // : -5
i = -1/(-5)
i = 1/5
i in (-oo:1/5) U (1/5:+oo)
3/(1-(5*i)) = 0
3/(1-5*i) = 0
3 = 0
i belongs to the empty set
i belongs to the empty set
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