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k in (-oo:+oo)
6*k-(2*k)-6 = -22/3 // + -22/3
6*k-(2*k)-(-22/3)-6 = 0
6*k-2*k+22/3-6 = 0
4*k+4/3 = 0 // - 4/3
4*k = -4/3 // : 4
k = -4/3/4
k = -1/3
k = -1/3
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