Answers

Subtract 63/9 from 20/84

1^st number: 20/84, 2^nd number: 7 0/9

20/84 - 63/9 is -142/21.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 84 and 9 is 252
   
   Next, find the equivalent fraction of both fractional numbers with denominator 252
2. For the 1st fraction, since 84 × 3 = 252,
   20/84 = 20 × 3/84 × 3 = 60/252
3. Likewise, for the 2nd fraction, since 9 × 28 = 252,
   63/9 = 63 × 28/9 × 28 = 1764/252
4. Subtract the two like fractions:
   60/252 - 1764/252 = 60 - 1764/252 = -1704/252
5. After reducing the fraction, the answer is -142/21

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