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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
56/k = 8 // - 8
56/k-8 = 0
56*k^-1 = 8 // : 56
k^-1 = 1/7
-1 < 0
1/(k^1) = 1/7 // * k^1
1 = 1/7*k^1 // : 1/7
7 = k^1
k = 7
k = 7
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