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k in (-oo:+oo)
-6*k-(4*k) = 5/6 // - 5/6
-6*k-(4*k)-(5/6) = 0
-6*k-4*k-5/6 = 0
-10*k-5/6 = 0 // + 5/6
-10*k = 5/6 // : -10
k = 5/6/(-10)
k = -1/12
k = -1/12
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