My first instinct was to say all variables are 1 because that fits the first equation. But it doedsn't work.

This problem is actually easy to do, though hard to see.

The second equation is unnecessary and just there to throw you off.

Look at closely.

Is there anything you can do to simplify this equation?

Moving things around won't help, it will just complicate things.

You have to do something to every term in that equation.

Still don't know?

Find the square root of every term and there''s your answer.