х+7=2х-8-х+7=2х-83+у=2,7+4у4у-1,8= - 5у+3,62(х-4)=х-0,53(а+23)=4(а-4)(в+7)-(5в+6)=36-(5+а)=67+(-7а-12)0,3(х-2)-0,2(х+4)= -2,90,6(х+7)-0,5(х-3)= -6,80,3(6-3у)=4,5 - 0,8(у - 9)0,4(6 - 4у) = 0,5(7 - 3у) - 1,96,4(2 - 3у)=6(0,8у - 1)+6,80,8(2у+3)-1,8(3у-4)=0,62,3(5-3а)+7,6(а-2)= -1,48