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The square of 9 more than a number is equal to nine more than the square of a number. What is the number?
If the number is represented by X, then '4 more than a number' is represented by (X+4).
Every number greater than 1 has 1 and the number itself as factors. If it has no other factors besides these two factors, it is a prime number. If it has more factors than 1 and itself, it is a composite number.
Y + 7 = 7 more than y.
it is x + 5