$$36-12n+n^2 = 0$$
Answer
$$ n = 6 $$
Explanation
$$ \begin{aligned} 36-12n+n^2 &= 0&& \text{simplify left side} \\[1 em]n^2-12n+36 &= 0&& \\[1 em] \end{aligned} $$
$ x^{2}-12x+36 = 0 $ is a quadratic equation.
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