This equation was posted up by OnlyMath but got deleted because he posted 3 problems in 1 thread. He has not reposted it so I am because I'm curious as to how to solve it.

Find x.

I already know the answer is:

I have tried really hard to try and solve it, but I get stuck because there is a plus between the powers.

I can't go because it doesn't work. You have to go which doesn't help in solving x.

Can someone show me a step in the right direction?