$$ \begin{aligned} -\frac{1}{3}-\frac{4}{5} &= 0&& \text{multiply ALL terms by } \color{blue}{ 15 }. \\[1 em]-15\cdot\frac{1}{3}-15\cdot\frac{4}{5} &= 15\cdot0&& \text{cancel out the denominators} \\[1 em]-5-12 &= 0&& \text{simplify left side} \\[1 em]-17 &= 0&& \\[1 em] \end{aligned} $$
Since the statement $ \color{red}{ -17 = 0 } $ is FALSE, we conclude that the equation has no solution.
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