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D( i )
2*i = 0
2*i = 0
2*i = 0
2*i = 0 // : 2
i = 0
i in (-oo:0) U (0:+oo)
(6-(7*i))/(2*i) = 0
(6-7*i)/(2*i) = 0
6-7*i = 0 // - 6
-7*i = -6 // : -7
i = -6/(-7)
i = 6/7
i = 6/7
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