$$5x^2+18x-2 = 6$$
Answer
$$ \begin{matrix}x_1 = \dfrac{ 2 }{ 5 } & x_2 = -4 \\[1 em] \end{matrix} $$
Explanation
$$ \begin{aligned} 5x^2+18x-2 &= 6&& \text{move all terms to the left hand side } \\[1 em]5x^2+18x-2-6 &= 0&& \text{simplify left side} \\[1 em]5x^2+18x-8 &= 0&& \\[1 em] \end{aligned} $$
$ 5x^{2}+18x-8 = 0 $ is a quadratic equation.
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