Answers

Subtract 42/21 from 15/21

1^st number: 15/21, 2^nd number: 2 0/21

15/21 - 42/21 is -9/7.

Steps for subtracting fractions

1. Subtract the two fractions:
   15/21 - 42/21 = 15 - 42/21 = -27/21
2. After reducing the fraction, the answer is -9/7

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