Question
$$\frac{1}{x}+\frac{2}{x} = \frac{1}{3}x$$
Answer
$$ \begin{matrix}x_1 = 3 & x_2 = -3 \\[1 em] \end{matrix} $$
Explanation
$$ \begin{aligned} \frac{1}{x}+\frac{2}{x} &= \frac{1}{3}x&& \text{multiply ALL terms by } \color{blue}{ x\cdot3 }. \\[1 em]x\cdot3\cdot\frac{1}{x}+x\cdot3\cdot\frac{2}{x} &= x\cdot3 \cdot \frac{1}{3}x&& \text{cancel out the denominators} \\[1 em]3+6 &= x^2&& \text{simplify left side} \\[1 em]9 &= x^2&& \text{move all terms to the left hand side } \\[1 em]9-x^2 &= 0&& \text{simplify left side} \\[1 em]-x^2+9 &= 0&& \\[1 em] \end{aligned} $$
$ -x^{2}+9 = 0 $ is a quadratic equation.
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