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D( i )
-(5*i)-6 = 0
-(5*i)-6 = 0
-(5*i)-6 = 0
-5*i-6 = 0
-5*i-6 = 0 // + 6
-5*i = 6 // : -5
i = 6/(-5)
i = -6/5
i in (-oo:-6/5) U (-6/5:+oo)
(4-(7*i))/(-(5*i)-6) = 0
(4-7*i)/(-5*i-6) = 0
4-7*i = 0 // - 4
-7*i = -4 // : -7
i = -4/(-7)
i = 4/7
i = 4/7
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