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Towards the bottom of this page. where it says Solving systems of equations modulo 26 is slightly more difficult than solving them normally, but it is still quite easy

How did D go from -15 to 11?

and how is the inverse of D 19? I don't understand how these numbers came up

  • 0
    -15 = 11 mod 26.2012-08-22
  • 0
    What is $D$ in the question?2012-08-22

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