Answers

Subtract 90/7 from 63/84

1^st number: 63/84, 2^nd number: 12 6/7

63/84 - 90/7 is -339/28.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 84 and 7 is 84
   
   Next, find the equivalent fraction of both fractional numbers with denominator 84
2. For the 1st fraction, since 84 × 1 = 84,
   63/84 = 63 × 1/84 × 1 = 63/84
3. Likewise, for the 2nd fraction, since 7 × 12 = 84,
   90/7 = 90 × 12/7 × 12 = 1080/84
4. Subtract the two like fractions:
   63/84 - 1080/84 = 63 - 1080/84 = -1017/84
5. After reducing the fraction, the answer is -339/28

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