From the sum of -1 / 7 and 3/ 14 subtract 2 / 21
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Answer:
[tex] = \frac{ - 1}{7} + \frac{3}{14} - \frac{2}{21} \\ = \frac{ - 2 + 3}{14} - \frac{2}{21} \\ = \frac{3 - 4}{42} \\ = \frac{ - 1}{42} [/tex]