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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
720/5 = 8640/k // - 8640/k
720/5-(8640/k) = 0
720/5-8640*k^-1 = 0
-8640*k^-1 = -144 // : -8640
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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