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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
16/(-10) = -8/k // + -8/k
16/(-10)-(-8/k) = 0
8*k^-1+16/(-10) = 0
8*k^-1 = 8/5 // : 8
k^-1 = 1/5
-1 < 0
1/(k^1) = 1/5 // * k^1
1 = 1/5*k^1 // : 1/5
5 = k^1
k = 5
k = 5
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