Question
$$6a\cdot3 = 186a$$
Answer
$$ a = 0 $$
Explanation
$$ \begin{aligned} 6a\cdot3 &= 186a&& \text{simplify left side} \\[1 em]18a &= 186a&& \text{move the $ \color{blue}{ 186a } $ to the left side} \\[1 em]18a-186a &= 0&& \text{simplify left side} \\[1 em]-168a &= 0&& \text{ divide both sides by $ -168 $ } \\[1 em]a &= \frac{0}{-168}&& \\[1 em]a &= 0&& \\[1 em] \end{aligned} $$
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