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D( i )
3-(7*i) = 0
3-(7*i) = 0
3-(7*i) = 0
3-7*i = 0
3-7*i = 0 // - 3
-7*i = -3 // : -7
i = -3/(-7)
i = 3/7
i in (-oo:3/7) U (3/7:+oo)
(2*i)/(3-(7*i)) = 0
(2*i)/(3-7*i) = 0
2*i = 0 // : 2
i = 0
i = 0
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