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= 3 i 11/15 - ( 3 i 16/15 - 6/15) =
= 3 i 11/15 - 3 i 10/15 =
= 1/15
(4 i 5/13 - 1 i 5/13) + (6 i 2/13 - 1 i 11/13) =
= 3 + ( 6 i 15/13 - 1 i 11/13)=
= 3 + 5 i 4/13 =
= 8 i 4/13