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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
12-(5/k)-3 = 0
12-5*k^-1-3 = 0
-5*k^-1 = -9 // : -5
k^-1 = 9/5
-1 < 0
1/(k^1) = 9/5 // * k^1
1 = 9/5*k^1 // : 9/5
5/9 = k^1
k = 5/9
k = 5/9
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