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Addition

?-821=821a 0b...

Question

$? - \frac{8}{21} = \frac{8}{21}$
(a) 0
(b) 1
(c) $\frac{21}{8}$
(d) $\frac{16}{21}$

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Solution

(d) $\frac{16}{21}$

$? - \frac{8}{21} = \frac{8}{21} ? = \frac{8}{21} + \frac{8}{21} = \frac{16}{21}$

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