Раскройте скобки и приведите подобные слагаемые
а) 5(х-3)-(6х-11);
б) 6(2х+3)-4(7х-20);
в) -7(3-4с)+14(0,5+2с);
г) 3(2,1х-у)-2,8(2х-3у).
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