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20 11/12+(20 11/12+3/8)=20 11/12+ (20 22/24+9/24)=20 11/12+30 7/24=20 22/24+30 7/24=51 5/24
51 5/24+[(20 22/24-30 7/24)-2 8/24]=51 5/24+(-9 9/24-2 8/24)=51 5/24+(-11 17/24)=39 12/24
Odp 39,5