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\frac{140+17}{20}-\frac{4\times 5+1}{5}
Multiply 7 and 20 to get 140.
\frac{157}{20}-\frac{4\times 5+1}{5}
Add 140 and 17 to get 157.
\frac{157}{20}-\frac{20+1}{5}
Multiply 4 and 5 to get 20.
\frac{157}{20}-\frac{21}{5}
Add 20 and 1 to get 21.
\frac{157}{20}-\frac{84}{20}
Least common multiple of 20 and 5 is 20. Convert \frac{157}{20} and \frac{21}{5} to fractions with denominator 20.
\frac{157-84}{20}
Since \frac{157}{20} and \frac{84}{20} have the same denominator, subtract them by subtracting their numerators.
\frac{73}{20}
Subtract 84 from 157 to get 73.