Question

subtractions of mixed fractions 3/7-4/21

Answer 1

simple answer of above can be
$\frac{3}{7} \times \frac{3}{3} = \frac{9}{21} \\ now \: subtracting \: \frac{4}{21} from \: this \\ \frac{9}{21} - \frac{4}{21} = \frac{5}{21}$

Answer 2

Hey Mate

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