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\frac{21}{35}-\frac{30}{35}=50
Least common multiple of 5 and 7 is 35. Convert \frac{3}{5} and \frac{6}{7} to fractions with denominator 35.
\frac{21-30}{35}=50
Since \frac{21}{35} and \frac{30}{35} have the same denominator, subtract them by subtracting their numerators.
-\frac{9}{35}=50
Subtract 30 from 21 to get -9.
-\frac{9}{35}=\frac{1750}{35}
Convert 50 to fraction \frac{1750}{35}.
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Compare -\frac{9}{35} and \frac{1750}{35}.
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