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-\frac{3}{4}+\frac{15}{-21}
Reduce the fraction \frac{-18}{24} to lowest terms by extracting and canceling out 6.
-\frac{3}{4}-\frac{5}{7}
Reduce the fraction \frac{15}{-21} to lowest terms by extracting and canceling out 3.
-\frac{21}{28}-\frac{20}{28}
Least common multiple of 4 and 7 is 28. Convert -\frac{3}{4} and \frac{5}{7} to fractions with denominator 28.
\frac{-21-20}{28}
Since -\frac{21}{28} and \frac{20}{28} have the same denominator, subtract them by subtracting their numerators.
-\frac{41}{28}
Subtract 20 from -21 to get -41.