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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
