$$ \begin{aligned} c &= \frac{1}{3}\cdot180&& \text{multiply ALL terms by } \color{blue}{ 3 }. \\[1 em]3c &= 3 \cdot \frac{1}{3}\cdot180&& \text{cancel out the denominators} \\[1 em]3c &= 180&& \text{ divide both sides by $ 3 $ } \\[1 em]c &= \frac{180}{3}&& \\[1 em]c &= 60&& \\[1 em] \end{aligned} $$
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