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D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
4/k+3 = 8/14 // - 8/14
4/k-(8/14)+3 = 0
4/k-4/7+3 = 0
4*k^-1 = -17/7 // : 4
k^-1 = -17/28
-1 < 0
1/(k^1) = -17/28 // * k^1
1 = -17/28*k^1 // : -17/28
-28/17 = k^1
k = -28/17
k = -28/17
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