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Modular multiplication

Problem

Given:
A, start text, space, m, o, d, space, end text, 12, equals, 5
left parenthesis, A, dot, 39, right parenthesis, start text, space, m, o, d, space, end text, 12, equals, Y  
Solve for Y.
  • Your answer should be
  • an integer, like 6
Stuck?
Stuck?