19.6+y=7*(1.2-y)
0.4(6-4y)=0.5(7-3y)
5/4(1/6x-1/3)=2x-11 1/2

19,6+y=7(1,2-y)19,6+y=8,4-7уу+7у=8,4-19,68у=-11,2у=-11,2/8у=-1,40,4(6-4у)=0,5(7-3у)2,4-1,6у=3,5-1,5у-1,6у+1,5у=3,5-2,4-0,1у=1,1у=-1,1/0,1у=-11