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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
12/5 = 60/k // - 60/k
12/5-(60/k) = 0
12/5-60*k^-1 = 0
-60*k^-1 = -12/5 // : -60
k^-1 = 1/25
-1 < 0
1/(k^1) = 1/25 // * k^1
1 = 1/25*k^1 // : 1/25
25 = k^1
k = 25
k = 25
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