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3/5- 6/7• {7/12• 8/1+ 1}=
3/5- 6/7• {7/3• 2/1+ 1}=
3/5- 6/7• {14/3+ 1}=
3/5- 6/7• 14/3 - 6/7• 1=
3/5- 2/1• 2/1 -6/7= 3/5- 4/1 -6/7=
(3•7)/(5•7)- (4•7•5)/(1•7•5) - (6•5)/(7•5)=
21/35- 140/35 -30/35=
-(140+30-21)/35=
- 149/35= - 4 9/35
Y en foto