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F) 76 i 2/3 - ( 19 i 1/5 + 25 i 4/9) - 18 i 1/6
G) 46 i 5/6 - ( 3 i 5/7 + 28 i 6/7 + 5 i 2/21)
H) 65 i 1/2 - ( 87 i 3/4 + 16 i 4/5 - 94 i 3/8
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F)76i2/3-(19i1/5+25i4/9)-18i1/6=230/3-(96/5+229/9)-109/6=230/3-(864/45+1145/45)
-109/6=230/3-2009/45-109/6=6900/90-4018/90-1635/90=1247/90=13i77/90
G)281/6-(26/7+202/7+107/21)=281/6-(78/21+606/21+107/21)=281/6-791/21=
1967/42-1582/42=385/42=9i7/42=9i1/6
H)131/2-(351/4+84/5-755/8)=131/2-(3510/40+672/40-3775/40)=
131/2-407/40=2620/40-407/40=2213/40=55i13/40