$$-\frac{5}{6}a = 1$$
Answer
$$ a = -\frac{6}{5} $$
Explanation
$$ \begin{aligned} -\frac{5}{6}a &= 1&& \text{multiply ALL terms by } \color{blue}{ 6 }. \\[1 em]-6 \cdot \frac{5}{6}a &= 6\cdot1&& \text{cancel out the denominators} \\[1 em]-5a &= 6&& \text{ divide both sides by $ -5 $ } \\[1 em]a &= -\frac{6}{5}&& \\[1 em] \end{aligned} $$
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