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D( i )
0.3*i-1 = 0
0.3*i-1 = 0
0.3*i-1 = 0
0.3*i-1 = 0 // + 1
0.3*i = 1 // : 0.3
i = 1/0.3
i = 3.33333333
i in (-oo:3.33333333) U (3.33333333:+oo)
(0.6*i+1)/(0.3*i-1) = 0
0.6*i+1 = 0 // - 1
0.6*i = -1 // : 0.6
i = -1/0.6
i = -1.66666667
i = -1.66666667
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