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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
7*(9/k) = 84 // - 84
7*(9/k)-84 = 0
63*k^-1 = 84 // : 63
k^-1 = 4/3
-1 < 0
1/(k^1) = 4/3 // * k^1
1 = 4/3*k^1 // : 4/3
3/4 = k^1
k = 3/4
k = 3/4
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