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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
5/12 = 45/k // - 45/k
5/12-(45/k) = 0
5/12-45*k^-1 = 0
-45*k^-1 = -5/12 // : -45
k^-1 = 1/108
-1 < 0
1/(k^1) = 1/108 // * k^1
1 = 1/108*k^1 // : 1/108
108 = k^1
k = 108
k = 108
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