Question

8/21 - 2/7 = a/21 then a =

Answer 1

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$\frac{8}{21} - \frac{2}{7} = \frac{a}{21} \\ \frac{8 - 6}{21} = \frac{a}{21} \\ \frac{2}{21} = \frac{a}{21} \\ a = 2$

Answer 2

the answer is

= 8 / 21 - 2 × 3 / 7 × 3 = 8 / 21 - 6 / 21

= 8 - 6 / 21

= 2 / 21

then a is 2.

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