There is nothing to "evaluate" there; that's a pure number.
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Unfortunately there is no expression to evaluate!
You evaluate the expression !! :)
To evaluate an expression is nothing but to operate the given expression according to the operators given in the expression if it is evaluable i.e, it could be convertable.
Take 3 and substitute into the expression given to you but not mentioned in the question here and evaluate the expression. "Sub and Solve" I say.
evaluate means to figure out the value of something