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You can use the function() method of symbolic expressions to obtain a callable symbolic expression, which is what you get with f(x) = x+2.
sage: b = y == x + 2
sage: b
y == x + 2
sage: f = b.rhs().function(x)
sage: f
x |--> x + 2
Note that you need to specify the argument of the function, in this case x, explicitly.
