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k in (-oo:+oo)
6*k-7 = 2*k-11 // - 2*k-11
6*k-(2*k)-7+11 = 0
6*k-2*k-7+11 = 0
4*k+4 = 0 // - 4
4*k = -4 // : 4
k = -4/4
k = -1
k = -1
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