To solve the equation \( 20 = d + 2d \), we will first combine like terms on the right side.
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Combine \( d \) and \( 2d \): \[ d + 2d = 3d \]
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Rewrite the equation: \[ 20 = 3d \]
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To solve for \( d \), divide both sides by 3: \[ d = \frac{20}{3} \]
Thus, the solution is: \[ d = \frac{20}{3} \text{ or approximately } 6.67 \]