Evaluate
-\frac{40}{63}\approx -0.634920635
Factor
-\frac{40}{63} = -0.6349206349206349
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\frac{9}{63}-\frac{49}{63}
Least common multiple of 7 and 9 is 63. Convert \frac{1}{7} and \frac{7}{9} to fractions with denominator 63.
\frac{9-49}{63}
Since \frac{9}{63} and \frac{49}{63} have the same denominator, subtract them by subtracting their numerators.
-\frac{40}{63}
Subtract 49 from 9 to get -40.
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