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D( i )
2*i+5 = 0
2*i+5 = 0
2*i+5 = 0
2*i+5 = 0 // - 5
2*i = -5 // : 2
i = -5/2
i in (-oo:-5/2) U (-5/2:+oo)
(3-(7*i))/(2*i+5) = 0
(3-7*i)/(2*i+5) = 0
3-7*i = 0 // - 3
-7*i = -3 // : -7
i = -3/(-7)
i = 3/7
i = 3/7
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