5:3 + (negative 5:2) + 4:2 + (negative 1:3)

simple form
=5 and 3 / 5-5 and 2 / 3 + 4 and 2 / 5-1 / 3
=(5 and 3 / 5 + 4 and 2 / 5) - (5 and 2 / 3 + 1 / 3)
=10-6
=4

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