[math-fun] Help in Maple

Hello math-fun members, A simple question: P is a polynomial in x + a polynomial in 1/x. For example, P=2/x^2 + 5x + 7 + 3/x^5, expecting 5x+12. What command (in Maple 7) will replace the x's from the denominator by 1 ? The following is rather cumbersome: for n from 1 to 5 do P:=subs(1/x^n=1,P) od; Thanks, Emeric