To rearrange the surface area equation \( S = \frac{1}{2}lp + B \) for the quantity of interest \( B \), follow these steps:
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Start with the original equation: \[ S = \frac{1}{2}lp + B \]
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Subtract \( \frac{1}{2}lp \) from both sides: \[ S - \frac{1}{2}lp = B \]
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Therefore, the rearranged equation is: \[ B = S - \frac{1}{2}lp \]
So, the final answer is: \[ B = S - \frac{1}{2}lp \]