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