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k in (-oo:+oo)
1-(5*k)-(4*k) = 64 // - 64
1-(5*k)-(4*k)-64 = 0
1-5*k-4*k-64 = 0
-9*k-63 = 0 // + 63
-9*k = 63 // : -9
k = 63/(-9)
k = -7
k = -7
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