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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
18/k+2 = 38 // - 38
18/k-38+2 = 0
18*k^-1 = 36 // : 18
k^-1 = 2
-1 < 0
1/(k^1) = 2 // * k^1
1 = 2*k^1 // : 2
1/2 = k^1
k = 1/2
k = 1/2
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