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Question

$(\frac{1 1}{- 1 5}) (\frac{- 7}{1 0}) + (\frac{- 3}{2 0}) (\frac{7}{3 0})$

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Solution

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$(\frac{- 1 1 \times - 7}{1 5 \times 1 0}) + (\frac{- 3 \times 7}{2 0 \times 3 0}) \frac{7 7}{1 5 0} - \frac{2 1}{6 0 0} \frac{3 0 8 - 2 1}{6 0 0} \frac{2 8 7}{6 0 0}$

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