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=2/3 - [24/40 - 4/5] / 3/4 =
= 2/3 - [3/5 - 4/5] / 3/4=
= 2/3 - (-1/5) / 3/4=
=2/3 - (-1/5) * 4/3 = 2/3 - (- 4/15) = 2/3 + 4/15 = 10/15 + 4/15 = 14/15
60 % z 14/15
6/10 * 14/15 = 84 / 150 = 42/75 = 14/25