To solve for \( b \) in the equation \( b - 0.7 = 3.2 \), you need to isolate \( b \).
Start by adding \( 0.7 \) to both sides of the equation:
\[ b - 0.7 + 0.7 = 3.2 + 0.7 \]
This simplifies to:
\[ b = 3.2 + 0.7 \]
Now, calculate the right side:
\[ b = 3.9 \]
Thus, the solution is:
\[ b = 3.9 \]