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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
84/k = 7 // - 7
84/k-7 = 0
84*k^-1 = 7 // : 84
k^-1 = 1/12
-1 < 0
1/(k^1) = 1/12 // * k^1
1 = 1/12*k^1 // : 1/12
12 = k^1
k = 12
k = 12
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