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6/7+ (90-42/140)+ 2/1=
6/7+(48/140)+ 2/1=
simplificando 48/140= 12/35
6/7+12/35+2/1=
agrupo
(6/7+12/35)+2/1=
(210+84/245) + 2/1=
294/245 + 2/1=
(588+245/245)=
833/245=
simplificando 833/245
17/5