87/21 - 73/21 = 14/21 = 2/3
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Seven tens minus one ten(70-10) equals six tens(60).
Ten minus nine eights equals eight and seven eighths.
Eleven fifteenths minus ten fifteenths is equal to one fifteenth.
7/9 − 5/10 = 25/90 which reduces to 5/18
6 and 9/8