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k in (-oo:+oo)
5*k+9 = 65-2*k // - 65-2*k
5*k-(-2*k)-65+9 = 0
5*k+2*k-65+9 = 0
7*k-56 = 0 // + 56
7*k = 56 // : 7
k = 56/7
k = 8
k = 8
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