Copyright © University of Cambridge. All rights reserved.
'Symbol' printed from http://nrich.maths.org/
We define $a\oplus b = ab + a + b $. Given that $3 \oplus 5= 2 \oplus x$, what is the value of $x$?
If you liked this problem, here is an NRICH task which challenges you to use similar mathematical ideas.
This problem is taken from the UKMT Mathematical Challenges.