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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)
(2-i)/(2*i+7) = 0
2-i = 0 // - 2
-i = -2 // * -1
i = 2
i = 2
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