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k in (-oo:+oo)
64 = 2*k+3*k+9 // - 2*k+3*k+9
64-(2*k)-(3*k)-9 = 0
64-2*k-3*k-9 = 0
55-5*k = 0 // - 55
-5*k = -55 // : -5
k = -55/(-5)
k = 11
k = 11
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