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58. For every positive 2-digit number, x, with tens digit t
and units digit u, let y be the 2-digit number formed by
reversing the digits of x. Which of the following
expressions is equivalent to x − y ?

  • F. 9(t − u)

  • G. 9(u − t)

  • H. 9t − u

  • J. 9u

  • K. 0