1) 4(3а+1,6)-(5+2а)-3(а-1,2);
2)-1,5(6-х)-2(-х-3)+0.9(5х-1);
3)0,8(2у-3)+5(1,6-0,5у)-2(0.8у-1,7);
4)5/6(1/5n+6)-2/3(9-1/2n)+5/8(4/5n-8).
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