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\frac{\frac{4}{10}-\frac{5}{10}}{\frac{1}{2}\times \frac{2}{5}}
Least common multiple of 5 and 2 is 10. Convert \frac{2}{5} and \frac{1}{2} to fractions with denominator 10.
\frac{\frac{4-5}{10}}{\frac{1}{2}\times \frac{2}{5}}
Since \frac{4}{10} and \frac{5}{10} have the same denominator, subtract them by subtracting their numerators.
\frac{-\frac{1}{10}}{\frac{1}{2}\times \frac{2}{5}}
Subtract 5 from 4 to get -1.
\frac{-\frac{1}{10}}{\frac{1\times 2}{2\times 5}}
Multiply \frac{1}{2} times \frac{2}{5} by multiplying numerator times numerator and denominator times denominator.
\frac{-\frac{1}{10}}{\frac{1}{5}}
Cancel out 2 in both numerator and denominator.
-\frac{1}{10}\times 5
Divide -\frac{1}{10} by \frac{1}{5} by multiplying -\frac{1}{10} by the reciprocal of \frac{1}{5}.
\frac{-5}{10}
Express -\frac{1}{10}\times 5 as a single fraction.
-\frac{1}{2}
Reduce the fraction \frac{-5}{10} to lowest terms by extracting and canceling out 5.