$$1 = xx-6x$$
Answer
$$ \begin{matrix}x_1 = 3-\sqrt{ 10 } & x_2 = 3+\sqrt{ 10 } \\[1 em] \end{matrix} $$
Explanation
$$ \begin{aligned} 1 &= xx-6x&& \text{move all terms to the left hand side } \\[1 em]1-x^2+6x &= 0&& \text{simplify left side} \\[1 em]-x^2+6x+1 &= 0&& \\[1 em] \end{aligned} $$
$ -x^{2}+6x+1 = 0 $ is a quadratic equation.
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