I have a function which contains text and numbers which I want t evaluate.

For example, 3*x+3+y

I use replace to replace the x with a number, say x = 3, then

3*3+3+y

I want the answer to be displayed as 12+y

I can't use the & symbol for some resons which I don't want to go through.

Is there a way to get the above result without the use of &.