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\frac{10}{15}-\frac{3}{15}+\frac{4}{3}-\frac{4}{5}
Least common multiple of 3 and 5 is 15. Convert \frac{2}{3} and \frac{1}{5} to fractions with denominator 15.
\frac{10-3}{15}+\frac{4}{3}-\frac{4}{5}
Since \frac{10}{15} and \frac{3}{15} have the same denominator, subtract them by subtracting their numerators.
\frac{7}{15}+\frac{4}{3}-\frac{4}{5}
Subtract 3 from 10 to get 7.
\frac{7}{15}+\frac{20}{15}-\frac{4}{5}
Least common multiple of 15 and 3 is 15. Convert \frac{7}{15} and \frac{4}{3} to fractions with denominator 15.
\frac{7+20}{15}-\frac{4}{5}
Since \frac{7}{15} and \frac{20}{15} have the same denominator, add them by adding their numerators.
\frac{27}{15}-\frac{4}{5}
Add 7 and 20 to get 27.
\frac{9}{5}-\frac{4}{5}
Reduce the fraction \frac{27}{15} to lowest terms by extracting and canceling out 3.
\frac{9-4}{5}
Since \frac{9}{5} and \frac{4}{5} have the same denominator, subtract them by subtracting their numerators.
\frac{5}{5}
Subtract 4 from 9 to get 5.
1
Divide 5 by 5 to get 1.