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k in (-oo:+oo)
k+4 = 7*k-(4/3) // - 7*k-(4/3)
k-(7*k)+4/3+4 = 0
k-7*k+4/3+4 = 0
16/3-6*k = 0 // - 16/3
-6*k = -16/3 // : -6
k = -16/3/(-6)
k = 8/9
k = 8/9
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