To solve for \( u \) in the equation \( u - 161 = -752 \), you need to isolate \( u \).
You can do this by adding 161 to both sides of the equation:
\[ u - 161 + 161 = -752 + 161 \]
This simplifies to:
\[ u = -752 + 161 \]
Now, calculate the right side:
\[ u = -591 \]
So, \( u = -591 \).