1973 USAMO ( System of equations)
6:45
m!n!=10!
17:08
Solving a Quartic Equation
14:11
A Diophantine Equation @dhdkro
10:34
A puzzle or a system of equations?
17:33
Find (x+y+z) [Harvard-MIT] Guts contest
10:42
A USAMO Problem | Video Response To @PrimeNewtons
17:10
Third International Mathematics Olympiad #2
19:32