To rearrange the equation \( Q = RS - 4 \) for the quantity of interest, let's isolate \( R \).
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Add 4 to both sides to eliminate the constant on the right side: \[ Q + 4 = RS \]
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Divide both sides by \( S \) to solve for \( R \): \[ R = \frac{Q + 4}{S} \]
Now, the equation is rearranged to find \( R \) in terms of \( Q \) and \( S\): \[ R = \frac{Q + 4}{S} \]