Question
$$12y = \frac{40}{12}$$
Answer
$$ y = \dfrac{5}{18} $$
Explanation
$$ \begin{aligned} 12y &= \frac{40}{12}&& \text{multiply ALL terms by } \color{blue}{ 12 }. \\[1 em]12\cdot12y &= 12\cdot\frac{40}{12}&& \text{cancel out the denominators} \\[1 em]144y &= 40&& \text{ divide both sides by $ 144 $ } \\[1 em]y &= \frac{40}{144}&& \\[1 em]y &= \frac{5}{18}&& \\[1 em] \end{aligned} $$
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