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7,8-5,4-12,1=2,4-12,1=-9,7
-1 1/3-9/2+1/6=-1 2/6-27/6+1/6=-1 2/6-26/6=-1 28/6=-5 4/6=-5 2/3
1 1/8-2 1/4-_1/2)=1 1/8-2 2/8+4/8=1 1/8-1 6/8=-5/8
co do ostatniego prosze podac gdzie konczy sie nawias