Question
$$-8x^2+3x+10+8x+9 = 0$$
Answer
$$ \begin{matrix}x_1 = -1 & x_2 = \dfrac{ 19 }{ 8 } \\[1 em] \end{matrix} $$
Explanation
$$ \begin{aligned} -8x^2+3x+10+8x+9 &= 0&& \text{simplify left side} \\[1 em]-8x^2+11x+19 &= 0&& \\[1 em] \end{aligned} $$
$ -8x^{2}+11x+19 = 0 $ is a quadratic equation.
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