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$$2x-24+x^2 = 0$$
Answer
$$ \begin{matrix}x_1 = 4 & x_2 = -6 \\[1 em] \end{matrix} $$
Explanation
$$ \begin{aligned} 2x-24+x^2 &= 0&& \text{simplify left side} \\[1 em]x^2+2x-24 &= 0&& \\[1 em] \end{aligned} $$
$ x^{2}+2x-24 = 0 $ is a quadratic equation.
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