Operation x*y denotes the number find the value x*4=x*3

Answer 1

you say it denotes "the number" but fail to say what that is.
Then you say "x*4=x*3" which is an equation, not a value. Maybe you want to find the value of x which satisfies the equation, but you don't do a very good job of saying so.

Remember, It's not my job to figure out what you mean.
It's your job to say it so clearly you cannot be misunderstood.