(5/2-1/3/4-)-(1/2+1)
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(5/2-1/3/4)-(1/2+1)=
(5/2-1/3•1/4)-(1/2+1)=
(5/2-1/12)-(1+2)/2=
(30-1)/12-6/12=
(29-6)/12=
23/12
(5/2-1/3•1/4)-(1/2+1)=
(5/2-1/12)-(1+2)/2=
(30-1)/12-6/12=
(29-6)/12=
23/12
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