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D( i )
2*i+7 = 0
2*i+7 = 0
2*i+7 = 0
2*i+7 = 0 // - 7
2*i = -7 // : 2
i = -7/2
i in (-oo:-7/2) U (-7/2:+oo)
(3-(4*i))/(2*i+7) = 0
(3-4*i)/(2*i+7) = 0
3-4*i = 0 // - 3
-4*i = -3 // : -4
i = -3/(-4)
i = 3/4
i = 3/4
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