Solutions by everydaycalculation.com

17 - 79 is -4063.

- Find the least common denominator or LCM of the two denominators:

LCM of 7 and 9 is**63**

Next, find the equivalent fraction of both fractional numbers with denominator 63 - For the 1st fraction, since 7 × 9 = 63,

17 = 1 × 97 × 9 = 963 - Likewise, for the 2nd fraction, since 9 × 7 = 63,

79 = 7 × 79 × 7 = 4963 - Subtract the two like fractions:

963 - 4963 = 9 - 4963 = -4063

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