Answer
$7$
Work Step by Step
Since $7*4=28$ which is 1 mod 9, 7 is an inverse of 4 mod 9.
Discrete Mathematics and Its Applications, Seventh Edition
by Rosen, Kenneth
Published by
McGraw-Hill Education
ISBN 10:
0073383090
ISBN 13:
978-0-07338-309-5
Chapter 4 - Section 4.4 - Solving Congruences - Exercises - Page 284: 3
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