Algebraic expressions allow you to organize the information so you can make a easier decision
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In order to subtract two rational expressions by simply subtracting their numerators you must make sure that their denominators are equal.
All real numbers
Placing a question mark at the end of a list of expressions or numbers does not make it a sensible question.
You can have infinitely many mathematical expressions that equal 13. Or any other given number. For example, 13 + 0, 12 + 1, 11 + 2, etc., then 0 + 13, - 1 + 14, -2 + 15, etc. ... there you have infinitely many. You can make up lots of other types of expressions that give the same result.