(13/8*1,2-7/14)*(16*3/20-14/25)=
(13/8*6/5-1/2)*(12/5-14/25)=
(39/20-10/20)*(60/25-14/25)=
(29/20)*(46/25)=29*23/25*10=667/250
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(13/8*1,2-7/14)*(16*3/20-14/25)=
(13/8*6/5-1/2)*(12/5-14/25)=
(39/20-10/20)*(60/25-14/25)=
(29/20)*(46/25)=29*23/25*10=667/250