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Verified Answer :

\(\frac{d}{-3} \leq -6 \\ \\ - \frac{d}{3} \leq -6 \\ \\ -d \leq -6 \times 3 \\ \\ -d \leq -18 \\ \\ d \geq 18 \\ \\\)

The final result is: d ≥ 18.