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k in (-oo:+oo)
2*k+6 = 5*k-18 // - 5*k-18
2*k-(5*k)+6+18 = 0
2*k-5*k+6+18 = 0
24-3*k = 0 // - 24
-3*k = -24 // : -3
k = -24/(-3)
k = 8
k = 8
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