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D( i )
3*i-(10*i) = 0
3*i-(10*i) = 0
3*i-(10*i) = 0
3*i-10*i = 0
-7*i = 0 // : -7
i = 0
i in (-oo:0) U (0:+oo)
(2*i+6)/(3*i-(10*i)) = 0
(2*i+6)/(3*i-10*i) = 0
(2*i+6)/(-7*i) = 0
2*i+6 = 0 // - 6
2*i = -6 // : 2
i = -6/2
i = -3
i = -3
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