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2014-01-29T13:40:23+02:00
5/12:(1/3-1/2)+1/6=
= 5/12:((2+3)/6)+1/6=
=5/12:5/6+1/6=
=5/12*6/5+1/6=
=1/2+1/6=
=3/6+1/6=
=4/6=
=2/3