Solve for \( u \). \[ 173-u=36 \] \( u=\square \)

To solve for \( u \), we need to isolate it on one side of the equation. We start with: \[ 173 - u = 36 \] To isolate \( u \), we can subtract 173 from both sides: \[ -u = 36 - 173 \] Calculating the right side gives: \[ -u = -137 \] To find \( u \), we multiply both sides by -1: \[ u = 137 \] So, the solution is \( u = 137 \).