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