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D( i )
4-(7*i) = 0
4-(7*i) = 0
4-(7*i) = 0
4-7*i = 0
4-7*i = 0 // - 4
-7*i = -4 // : -7
i = -4/(-7)
i = 4/7
i in (-oo:4/7) U (4/7:+oo)
(2-(5*i))/(4-(7*i)) = 0
(2-5*i)/(4-7*i) = 0
2-5*i = 0 // - 2
-5*i = -2 // : -5
i = -2/(-5)
i = 2/5
i = 2/5
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