To solve the equation \( 4d + 1 = 41 \), you need to follow these two steps:
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Subtract 1 from both sides: \[ 4d + 1 - 1 = 41 - 1 \implies 4d = 40 \]
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Divide by 4: \[ d = \frac{40}{4} \implies d = 10 \]
Thus, the correct response is: Subtract 1 and divide by 4, d=10.