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k in (-oo:+oo)
7*k-6 = 3*k-14 // - 3*k-14
7*k-(3*k)-6+14 = 0
7*k-3*k-6+14 = 0
4*k+8 = 0 // - 8
4*k = -8 // : 4
k = -8/4
k = -2
k = -2
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