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I don't know if there is a better way, except you can make it callable in this sense by doing chaesloc2's thing with the c(x) notation.

sage: var('y')
y
sage: a = y - 2 == x
sage: b = solve(a, y)
sage: b
[y == x + 2]
sage: c(x) = b[0].rhs()
sage: c(5)
7

I doubt there is a more terse workaround.