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k in (-oo:+oo)
-9*k-(6*k) = 5/7 // - 5/7
-9*k-(6*k)-(5/7) = 0
-9*k-6*k-5/7 = 0
-15*k-5/7 = 0 // + 5/7
-15*k = 5/7 // : -15
k = 5/7/(-15)
k = -1/21
k = -1/21
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