To solve for \( B \) from the equation \( A = 5B + 9C \), you need to isolate \( B \) on one side of the equation.
Starting with the equation:
\[ A = 5B + 9C \]
- Subtract \( 9C \) from both sides:
\[ A - 9C = 5B \]
- Now, divide both sides by 5 to solve for \( B \):
\[ B = \frac{A - 9C}{5} \]
So, the solution for \( B \) is:
\[ B = \frac{A - 9C}{5} \]