17-5n
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the number is 3 because 3 times 5 is 15 plus 2 is 17
5x+17
1*5 = 5 11-5 = 6
The "number" is 8. 8-3=5 5*7=35
The special divisibility rule of 17 is "Take the difference of the rest of the digits and the last digit times 5." For instance: 17 1 - 7 * 5 = 1 - 35 = -34 which is divisible by 17.