# Revision history [back]

If $x$ is to be treated as a polynomial, then the following might suit your needs:

sage: var('y z')
(y, z)
sage: x = 4/5*(4*y - 3)*z - 1/3
sage: x.polynomial(RR)
3.20000000000000*y*z - 2.40000000000000*z - 0.333333333333333


Try

sage: RR?


for more information about RR