-(2/13-1/3-1/6)×78

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-(2/13-1/3-1/6)×78-(2/13-1/3-1/6)×78-(2/13-1/3-1/6)×78=-12+26+13=27

-(2/13-1/3-1/6)×78
-(2/13-1/3-1/6)×78

-(2/13-1/3-1/6)×78
=-12+26+13=27