7 / 10 plus 8 / 15 minus (1 / 3 plus 1 / 2)

7 / 10 + 8 / 15 - (1 / 3 + 1 / 2)
=21 / 30 + 16 / 30 - (2 / 6 + 3 / 6)
=37 out of 30-5 out of 6
=37 / 30-25 / 30
=12 out of 30
=Two fifths
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