26. For a three-digit number $x$, it is known that if you subtract 7 from it, the result will be divisible by 7, if you subtract 8, the result will be divisible by 8, and if you subtract 9, the result will be divisible by 9. What is this number?
26. The desired number is divisible by 7, 8, and 9. Therefore, this number is 504. There are no other such three-digit numbers.