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k in (-oo:+oo)
4*k-6 = 71-3*k // - 71-3*k
4*k-(-3*k)-71-6 = 0
4*k+3*k-71-6 = 0
7*k-77 = 0 // + 77
7*k = 77 // : 7
k = 77/7
k = 11
k = 11
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