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If you do explicit division of polynomials with /, you (reasonably) end up in the fraction field of the polynomial ring. What you want to do instead is division with //, which is division (ignoring the remainder) in the polynomial ring. Since you know the remainder is zero, this will be the actual quotient, as a member of the polynomial ring.

(If you have an element q in the fraction field of R and it has denominator 1, then you can also convert it to an element of the polynomial ring by R(q).)