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k in (-oo:+oo)
k+5*k+6 = 48/7 // - 48/7
k+5*k-(48/7)+6 = 0
k+5*k-48/7+6 = 0
6*k-6/7 = 0 // + 6/7
6*k = 6/7 // : 6
k = 6/7/6
k = 1/7
k = 1/7
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