We can rewrite this as $x^2 = 529$.
Taking the square root of both sides, we get $x = \pm\sqrt{529}$.
We know that $20^2 = 400$ and $30^2 = 900$.
Let's try numbers ending in 3 or 7, since $3^2=9$ and $7^2=49$.
Let's try $23^2$: $23 \times 23 = 529$.
So, the roots
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