To solve for \( b \) in the equation \( A = 12(a + b) \), follow these steps:
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Start with the equation: \[ A = 12(a + b) \]
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Divide both sides by 12 to isolate \( a + b \): \[ \frac{A}{12} = a + b \]
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Now, subtract \( a \) from both sides to isolate \( b \): \[ b = \frac{A}{12} - a \]
So the solution for \( b \) is: \[ b = \frac{A}{12} - a \]