For anyone searching for more examples of similarly trivial higher-order equations, x^n-1=0 is a classic. X=1 is trivially a solution for any space with a reaso

For anyone searching for more examples of similarly trivial higher-order equations, x^n-1=0 is a classic. X=1 is trivially a solution for any space with a reasonable definition of 1, and in the complex numbers you have the "roots of unity" if you'd care for a short (or long) mathematical rabbit-hole. Higher-order equations don't necessarily have solutions over radicals, but some of them demonstrably do.