7)1/3(9*7/26+6)-5(0,3-2*7/26)=1/3*(63/26+6)-5(0,3-7/13)=21/26+2-1,5+35/13=21/26+35/13+0,5=91/26+0,5=3,5+0,5=4.
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7)1/3(9*7/26+6)-5(0,3-2*7/26)=1/3*(63/26+6)-5(0,3-7/13)=21/26+2-1,5+35/13=21/26+35/13+0,5=91/26+0,5=3,5+0,5=4.