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Change the mixed fractions to improper fractions, then to similar fractions:

As improper fractions:
- Multiply the whole number by the denominator, then add the numerator. The result is the numerator, the denominator is the same.

9/2 - 42/11 = difference

As similar fractions:
- Find the LCD (least common denominator).  LCD is (2)(11) = 22
- For each fraction, divide the LCD by the denominator.  Multiply the quotient by the numerator.  The result is the numerator; re-write as similar fractions.

99/22 - 84/22 = 15/22

The difference of the two fractions is 15/22,