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You can use the method .rhs() (for right hand side) as follows:

sage: a = solve(1-z-z^2==0,z)[0].rhs()
sage: a
-1/2*sqrt(5) - 1/2

You can use the method .rhs() (for right or .right hand side) side() as follows:

sage: a = solve(1-z-z^2==0,z)[0].rhs()
sage: a
-1/2*sqrt(5) - 1/2

You can use the method .rhs() or .right hand side().right_hand_side() as follows:

sage: a = solve(1-z-z^2==0,z)[0].rhs()
sage: a
-1/2*sqrt(5) - 1/2