## Possible values for x?

We can write the expression as follows:

This number is integer if and only if *x* + 19 is a divisor of 80. Since 80 has 10 integer divisors, so there are 10 possible values for *x*.

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We can write the expression as follows:

This number is integer if and only if *x* + 19 is a divisor of 80. Since 80 has 10 integer divisors, so there are 10 possible values for *x*.

Back to statement