Evaluate
-\frac{13}{72}\approx -0.180555556
Factor
-\frac{13}{72} = -0.18055555555555555
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\frac{21}{72}-\frac{34}{72}
Least common multiple of 24 and 36 is 72. Convert \frac{7}{24} and \frac{17}{36} to fractions with denominator 72.
\frac{21-34}{72}
Since \frac{21}{72} and \frac{34}{72} have the same denominator, subtract them by subtracting their numerators.
-\frac{13}{72}
Subtract 34 from 21 to get -13.
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