$$x^2-4x+9x+6+x^2-4x+9x+6 = 0$$
Answer
$$ \begin{matrix}x_1 = -2 & x_2 = -3 \\[1 em] \end{matrix} $$
Explanation
$$ \begin{aligned} x^2-4x+9x+6+x^2-4x+9x+6 &= 0&& \text{simplify left side} \\[1 em]2x^2+10x+12 &= 0&& \\[1 em] \end{aligned} $$
$ 2x^{2}+10x+12 = 0 $ is a quadratic equation.
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