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k in (-oo:+oo)
-(4*k)-10 = 5*k-64 // - 5*k-64
64-(4*k)-(5*k)-10 = 0
64-4*k-5*k-10 = 0
54-9*k = 0 // - 54
-9*k = -54 // : -9
k = -54/(-9)
k = 6
k = 6
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