16/21 - 51/3 =16/21-17 = 16-357/21 = -341/21
16/21-5 1/3=16/21-16/3=16/21-16/3×7/7=16/21-112/21= - 96/21=- 32/7=
=- 4 4/7
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16/21 - 51/3 =16/21-17 = 16-357/21 = -341/21
16/21-5 1/3=16/21-16/3=16/21-16/3×7/7=16/21-112/21= - 96/21=- 32/7=
=- 4 4/7