0,2(7-2у)=2,3-0,3(у-6)
0.2(7-2у)=2.3-0.3(у-6) 1.4-0.4у=2.3-0.3у+1.8 1.4-0.4у-2.3+0.3у-1,8=0 -0.1у-2,7=0|*(-1) 0,1у+2,7=0 у=27
спс