5/(6r) = 2/3
To solve for 'r':
1. Cross-multiply: 5 * 3 = 2 * 6r
2. Simplify: 15 = 12r
3. Solve for r: r = 15/12
4. Simplify the fraction: r = 5/4 or r = 1.25
Therefore, the answer is $\boxed{r = 5/4}$ or $\boxed{r = 1.25}$