Раскройте скобки и приведите подобные слагаемые: а) 3(а-4)-7(а+2)-5(2а-8) б) 4(5-3х)-(11-х); в) -0,4(6-4у)-(-3,5+1,5у)+1,9; г) -6(х+у)+3(2х-у);
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