Subtract:
7
9
−
11
21
\displaystyle \frac{{7}}{{9}}-\frac{{11}}{{21}}
9
7
−
21
11
Give your answer in reduced terms.
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\displaystyle
Enter your answer as a reduced fraction (like 5/3, not 10/6) or as an integer (like 4 or -2)
Do not enter mixed numbers
Enter DNE for Does Not Exist, oo for Infinity