РЕШИТЬ СИСТЕМУ УРАВНЕНИЙ.
1). {█(5х+3у=4@2х-у= -5)┤
2). {█(3х/4+ 3у/8= 9/2@2х/3= у/12+ 2/3)┤ 3). {█(3а+2в=1@2а+5в=8)┤
4). {█(10-4(2х+5)=6у-13@4у-63=5(4х-2у)+2)┤

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