7 less than a number is 4 more than a different number

Question

Is it x-7=z+4

Answer 1

Yes. “A number” can be any variable of your choosing. You chose “x” for the variable on the left side of the equality. “Seven less than” implies that you are subtracting 7 from the variable “x.” The phrase “four more than” implies that you are adding 4. I also see that you choose the variable “z” for the right side of the equality.