Solve for \( u \) \[ \frac{5 u}{3}=-20 \]

To solve for \( u \), we first need to isolate it. Start by multiplying both sides of the equation by \( \frac{3}{5} \) to eliminate the fraction: \[ u = -20 \times \frac{3}{5} \] Now, simplifying the right side: \[ u = -12 \] So, the solution is \( u = -12 \).