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D( k )
10*k = 0
10*k = 0
10*k = 0
10*k = 0 // : 10
k = 0
k in (-oo:0) U (0:+oo)
3/(10*k) = 1/5 // - 1/5
3/(10*k)-(1/5) = 0
3/(10*k)-1/5 = 0
3/10*k^-1 = 1/5 // : 3/10
k^-1 = 2/3
-1 < 0
1/(k^1) = 2/3 // * k^1
1 = 2/3*k^1 // : 2/3
3/2 = k^1
k = 3/2
k = 3/2
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