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[ 7 + 1/5]  - [6 + 2/5]    

Note that 7 + 1/5   =   6 + 1  + 1/5    =   6 + 5/5 + 1/5   =  6 + 6/5

So  now....it should be easy

[ 6 + 6/5]  - [6 + 2/5]   =  

[ 6 - 6 ] + [ 6/5 - 2/5]  =

4/5