= 7,4a+2,6b-2,5a+3,7b-6a+5b=(7,4а-2,5а-6а)+(2,6b+3,7b+5b)=11,3b-1,1a
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= 7,4a+2,6b-2,5a+3,7b-6a+5b=(7,4а-2,5а-6а)+(2,6b+3,7b+5b)=11,3b-1,1a