Question

simplify the following question​

Answer 1

$\frac{6}{7} - \frac{2}{1} + \frac{( - 7)}{9} + \frac{19}{21} \\ = \frac{54 - 126 + ( - 49) + 57}{63} \\ \frac{54 - 126 - 49 + 57}{63} \\ = \frac{111 - 175}{63} \\ = \frac{ - 64}{63} ans...$

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