$$ \begin{aligned} -4 &= \frac{6}{5}t&& \text{multiply ALL terms by } \color{blue}{ 5 }. \\[1 em]5\cdot(-4) &= 5 \cdot \frac{6}{5}t&& \text{cancel out the denominators} \\[1 em]-20 &= 6t&& \text{ swap the left and right side of the equation } \\[1 em]6t &= -20&& \text{ divide both sides by $ 6 $ } \\[1 em]t &= -\frac{20}{6}&& \\[1 em]t &= -\frac{10}{3}&& \\[1 em] \end{aligned} $$

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