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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-(4*i))/(3-(7*i)) = 0
(2-4*i)/(3-7*i) = 0
2-4*i = 0 // - 2
-4*i = -2 // : -4
i = -2/(-4)
i = 1/2
i = 1/2
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