So -20 × 636.39 / 0.6931 ≈ -12727.8 / 0.6931 ≈ -18368. But this is negative — invalid.

So -20 × 636.39 / 0.6931 ≈ -12727.8 / 0.6931 ≈ -18368. But this is negative — invalid.

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