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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)
(10*i-8)/(2*i) = 0
10*i-8 = 0 // + 8
10*i = 8 // : 10
i = 8/10
i = 4/5
i = 4/5
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