Question
$$\frac{2}{5}y = -10$$
Answer
$$ y = -25 $$
Explanation
$$ \begin{aligned} \frac{2}{5}y &= -10&& \text{multiply ALL terms by } \color{blue}{ 5 }. \\[1 em]5 \cdot \frac{2}{5}y &= 5\cdot(-10)&& \text{cancel out the denominators} \\[1 em]2y &= -50&& \text{ divide both sides by $ 2 $ } \\[1 em]y &= -\frac{50}{2}&& \\[1 em]y &= -25&& \\[1 em] \end{aligned} $$
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