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