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k in (-oo:+oo)
65 = 3*k+3*k-1 // - 3*k+3*k-1
1-(3*k)-(3*k)+65 = 0
1-3*k-3*k+65 = 0
66-6*k = 0 // - 66
-6*k = -66 // : -6
k = -66/(-6)
k = 11
k = 11
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