$$x^2 = 10x-25$$
Answer
$$ x = 5 $$
Explanation
$$ \begin{aligned} x^2 &= 10x-25&& \text{move all terms to the left hand side } \\[1 em]x^2-10x+25 &= 0&& \\[1 em] \end{aligned} $$
$ x^{2}-10x+25 = 0 $ is a quadratic equation.
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