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D( k )
2*k = 0
2*k = 0
2*k = 0
2*k = 0 // : 2
k = 0
k in (-oo:0) U (0:+oo)
0.5 = 7/(2*k) // - 7/(2*k)
0.5-(7/(2*k)) = 0
(-7/2)*k^-1+0.5 = 0
-7/2*k^-1 = -0.5 // : -7/2
k^-1 = 0.14285714
-1 < 0
1/(k^1) = 0.14285714 // * k^1
1 = 0.14285714*k^1 // : 0.14285714
7.00000014 = k^1
k = 7.00000014
k = 7.00000014
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