$$ \begin{aligned} \frac{8}{3} &= \frac{2}{15}j&& \text{multiply ALL terms by } \color{blue}{ 15 }. \\[1 em]15\cdot\frac{8}{3} &= 15 \cdot \frac{2}{15}j&& \text{cancel out the denominators} \\[1 em]40 &= 2j&& \text{ swap the left and right side of the equation } \\[1 em]2j &= 40&& \text{ divide both sides by $ 2 $ } \\[1 em]j &= \frac{40}{2}&& \\[1 em]j &= 20&& \\[1 em] \end{aligned} $$

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