x
x
x


Do so in a way which:

 does not involve string manipulation of the input source code
 is plausibly extensible to a runtime-chosen set of bindings rather than just x
 does not make x a global variable


or note that these are impossible.



See also

 For more general examples and language-specific details, see Eval.
 Dynamic variable names is a similar task.


use MONKEY-SEE-NO-EVAL;
sub eval_with_x($code, *@x) { [R-] @x.map: -> \x { EVAL $code } }
 
say eval_with_x('3 * x', 5, 10);      # Says "15".
say eval_with_x('3 * x', 5, 10, 50);  # Says "105".