1)6x-(y-2.8)=(0.2x+1.5)-0.7 2) (5.3a-0.8)- ( 1.6-4.7а)=2а-(а-0.3)
3)-5 (3а+1)-11=-16
4)4/9(8.1-3.6х)=2.1(5/7-3/7х 1.6-4.7а)=2а-(а-0.3) 
РЕШИТЕ ОЧЕНЬ НАДО PS.четвёртое дробное
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