One, two and three soliton solutions are formally derived for a generalized version of the sixth-order KdV equation (KdV6) by using the Cole-Hopf transform. A comparison with particular cases of recently discovered completely integrable KdV6 equations are considered to illustrate the results obtained. Key words: Sixth-order KdV equation, , exact travelling wave solution, one soliton solution, two soliton solution, three soliton solution, multisoliton solution, solitary wave solution, Mathematica 8, Maple 15.