1(: if the variable is not given to you
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In expressions such as "x-y", both "x" and "y" can have any value. The value of "x-y" will depend on what the value of "x" and the value of "y" are.
Yes, numerical expressions can have the same value. For example, the expressions 2+3 and 5 both have the value of 5. Similarly, the expressions 2x3 and 6 both have the value of 6. In general, any two numerical expressions that evaluate to the same number will have the same value.
There is an infinite number of such expressions eg x = 1 + 1; x = sqrt 4 etc etc. I've a feeling you need to be more precise with your wording!
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