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Question: Make Rule for some equation

Question:Make Rule for some equation

digerdiga 385 Maple 17
rule
August 11 2013
2

Say I have the equation:

f:=x^5+a*x^4+b*x^3+c*x^2+d*x+e

and I want to introduce an identity namely

x^3:=1

Since

subs(x^3=1,f)

or

eval(f,x^3=1)

doesnt work I wonder what is the most elegant way to implement this?
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