Question
$$0 = x-3x$$
Answer
$$ x = 0 $$
Explanation
$$ \begin{aligned} 0 &= x-3x&& \text{simplify right side} \\[1 em]0 &= -2x&& \text{ swap the left and right side of the equation } \\[1 em]-2x &= 0&& \text{ divide both sides by $ -2 $ } \\[1 em]x &= \frac{0}{-2}&& \\[1 em]x &= 0&& \\[1 em] \end{aligned} $$
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