Question
$$30 = 8x^2-20x+2$$
Answer
$$ \begin{matrix}x_1 = -1 & x_2 = \dfrac{ 7 }{ 2 } \\[1 em] \end{matrix} $$
Explanation
$$ \begin{aligned} 30 &= 8x^2-20x+2&& \text{move all terms to the left hand side } \\[1 em]30-8x^2+20x-2 &= 0&& \text{simplify left side} \\[1 em]-8x^2+20x+28 &= 0&& \\[1 em] \end{aligned} $$
$ -8x^{2}+20x+28 = 0 $ is a quadratic equation.
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