Add or subtract
5
21
−
4
15
\displaystyle \frac{{5}}{{21}}-\frac{{4}}{{15}}
21
5
−
15
4
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Question 6
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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