1/2.1/5+1/2.1/3-1/5.1/6+1/2+1/5
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1/2.1/5+1/2.1/3-1/5.1/6+1/2+1/5=
1/10+1/6-1/30+1/2+1/5=
3.1/30+5.1/30-1/30+15.1/30+6.1/30=
3/30+5/30-1/30+15/30+6/30=
8/30-1/30+15/30+6/30=
7/30+15/30+6/30=
22/30+6/30=
28/30=
14/15
1/10+1/6-1/30+1/2+1/5=
3.1/30+5.1/30-1/30+15.1/30+6.1/30=
3/30+5/30-1/30+15/30+6/30=
8/30-1/30+15/30+6/30=
7/30+15/30+6/30=
22/30+6/30=
28/30=
14/15
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