Simple calculation of 6 and 4 / 7-2 and 1 / 8 + 17 / 7-0.875

6 and 4 / 7 - 2 and 1 / 8 + 17 / 7 - 0.875
=(6 and 4 / 7 + 17 / 7) - (2 and 1 / 8 + 7 / 8)
=9-3
=6
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