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k in (-oo:+oo)
8 = k-5*k+6 // - k-5*k+6
8-(-5*k)-k-6 = 0
5*k-k-6+8 = 0
4*k+2 = 0 // - 2
4*k = -2 // : 4
k = -2/4
k = -1/2
k = -1/2
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