Solutions by everydaycalculation.com

121 - 15 is -16105.

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

LCM of 21 and 5 is**105** - For the 1st fraction, since 21 × 5 = 105,

121 = 1 × 521 × 5 = 5105 - Likewise, for the 2nd fraction, since 5 × 21 = 105,

15 = 1 × 215 × 21 = 21105 - Subtract the two fractions:

5105 - 21105 = 5 - 21105 = -16105

Related: ^{2}/_{21}-^{1}/_{5} ^{1}/_{21}-^{2}/_{5} ^{1}/_{42}-^{1}/_{5} ^{1}/_{21}-^{1}/_{10} ^{3}/_{21}-^{1}/_{5} ^{1}/_{21}-^{3}/_{5} ^{1}/_{63}-^{1}/_{5} ^{1}/_{21}-^{1}/_{15} ^{5}/_{21}-^{1}/_{5} ^{1}/_{21}-^{1}/_{25} ^{7}/_{21}-^{1}/_{5} ^{1}/_{21}-^{7}/_{5} ^{1}/_{21}-^{1}/_{35}

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