multiply first:
7/8 x 5/7 = 35/56
they need a common denominator to subtract, which would be 112.
15/16 x 7/7 = 105/112
35/56 x 2/2 = 70/112
105/112 - 70/112 = 35/112
that simplifies to 5/16.
simplify: 15/16 - 7/8 x 5/7
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