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k in (-oo:+oo)
-k-(5*k)-10 = -64 // + 64
64-k-(5*k)-10 = 0
64-k-5*k-10 = 0
54-6*k = 0 // - 54
-6*k = -54 // : -6
k = -54/(-6)
k = 9
k = 9
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