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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
4/32 = 8/k // - 8/k
4/32-(8/k) = 0
4/32-8*k^-1 = 0
-8*k^-1 = -1/8 // : -8
k^-1 = 1/64
-1 < 0
1/(k^1) = 1/64 // * k^1
1 = 1/64*k^1 // : 1/64
64 = k^1
k = 64
k = 64
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