$$2x^2 = x+21$$
Answer
$$ \begin{matrix}x_1 = -3 & x_2 = \dfrac{ 7 }{ 2 } \\[1 em] \end{matrix} $$
Explanation
$$ \begin{aligned} 2x^2 &= x+21&& \text{move all terms to the left hand side } \\[1 em]2x^2-x-21 &= 0&& \\[1 em] \end{aligned} $$
$ 2x^{2}-x-21 = 0 $ is a quadratic equation.
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