At least it was a problem with a known solution obtainable by a standard procedure in not too many steps. Could've also picked a deceptively simple Diophantine equation where it is unknown whether it even has any solutions or not: https://thehighergeometer.wordpress.com/2021/07/27/diophanti...
I think the real joke is that the average Facebook user, with no higher math, might be tricked into trying to solve it, and independently rediscover methods for solving diophantine equations and elliptic curves, all so that they can prove that they're in the 3% by commenting what the strawberry equals.