If 
and 
(i.e., 
and 
are relatively prime), then 
.
Cancellation Law
See also
CongruenceExplore with Wolfram|Alpha
References
Courant, R. and Robbins, H. What Is Mathematics?: An Elementary Approach to Ideas and Methods, 2nd ed. Oxford, England: Oxford University Press, p. 36, 1996.Shanks, D. Solved and Unsolved Problems in Number Theory, 4th ed. New York: Chelsea, p. 56, 1993.Referenced on Wolfram|Alpha
Cancellation LawCite this as:
Weisstein, Eric W. "Cancellation Law." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/CancellationLaw.html