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modInverse abstract method
int modInverse(Returns the modular multiplicative inverse of this integer modulo modulus.
The modulus must be positive.
It is an error if no modular inverse exists.
Source
int modInverse(int modulus);
  © 2012 the Dart project authors
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 https://api.dartlang.org/stable/1.24.3/dart-core/int/modInverse.html