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k in (-oo:+oo)
-9*k-(3*k) = 6/7 // - 6/7
-9*k-(3*k)-(6/7) = 0
-9*k-3*k-6/7 = 0
-12*k-6/7 = 0 // + 6/7
-12*k = 6/7 // : -12
k = 6/7/(-12)
k = -1/14
k = -1/14
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