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4 2/3 = 4 20/30
1 4/5 = 1 24/30.
(4 20/30 - 1 24/30 ) = ( 3 50/30 - 1 24/30 ) = 2 26/30
7 25/30 - 2 26/30 = 6 55/30 - 2 26/30 =4 29/30.
47/6 + (70/15-27/15)
47/6 + 43/15
470/60 +172/60
642/60 =10 42/60 = 10 7/10