21*(1/6-1/8)-3*(1/8-1/6)
[(7/8-2/5)-(11/40/2/5)]:(1i 19/20+9/5)
21*(1/6-1/8)-3*(1/8-1/6)=21/6-21/8-3/8+3/6=84/24-63/24-9/24+12/24=24/24=1
[(7/8-2/5)-(11/40/2/5)]:(1i 19/20+9/5)=[(35/40-16/40)-(11/40*5/2)]:(39/20+9/5)=(19/40-11/16):(39/20+36/20)=(38/80-55/80):75/20=-17/80*20/75=-17/300
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21*(1/6-1/8)-3*(1/8-1/6)=21/6-21/8-3/8+3/6=84/24-63/24-9/24+12/24=24/24=1
[(7/8-2/5)-(11/40/2/5)]:(1i 19/20+9/5)=[(35/40-16/40)-(11/40*5/2)]:(39/20+9/5)=(19/40-11/16):(39/20+36/20)=(38/80-55/80):75/20=-17/80*20/75=-17/300