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If {X: 2 d- x d- 19; X integer} and 7 + x = 4…

If {X: 2 d- x d- 19; X integer} and 7 + x = 4 (mod 9), find the highest value of x
  • A.
    2
  • B.
    5
  • C.
    15
  • D.
    18
Correct Answer: Option C
Explanation