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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
512/4 = 7680/k // - 7680/k
512/4-(7680/k) = 0
512/4-7680*k^-1 = 0
-7680*k^-1 = -128 // : -7680
k^-1 = 1/60
-1 < 0
1/(k^1) = 1/60 // * k^1
1 = 1/60*k^1 // : 1/60
60 = k^1
k = 60
k = 60
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