Question: n is a positive integer with an even number of digits. m is formed by moving the last digit of n to the front, so,

is a positive integer with an even number of digits. m is formed by moving the last digit of to the front, so, for example, if is 589274 then m is 458927, and if is 7310 then m is 731.

Prove that 11ln + m and 991n2 - m2.

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