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= 6 7/8 - 1/4 : 5/2 + 3 2/3 =
= 6 7/8 - 1/4 * 2/5 + 3 2/3 = 6 7/8 - 1/2 * 1/5 + 3 2/3 =
= 6 7/8 - 1/10 + 3 2/3 = 6 35/40 - 4/40 + 3 2/3 =
= 6 31/40 + 3 2/3 = 6 93/120 + 3 80/120 = 9 173/120 =
= 10 53/120
6i7/8-1/4*2/5+3i2/3=6i7/8-1/10+3i2/3=6i210/240-24/240+3i160/240=
10i130/240-24/240=10i106/240=10i53/120