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k in (-oo:+oo)
(-3/7)*k+6 = 9/7 // - 9/7
(-3/7)*k-(9/7)+6 = 0
(-3/7)*k-9/7+6 = 0
33/7-3/7*k = 0 // - 33/7
-3/7*k = -33/7 // : -3/7
k = -33/7/(-3/7)
k = 11
k = 11
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