0,2t+1,7t-0,54=0,22
5,6-2z-0,7z+2,65=7

1) 0,2t+1,7t-0,54=0,221.9t-0.54-0.22=01.9t-0.76=0t=0.76/1.9=0.42) 5,6-2z-0,7z+2,65=75.6-2.7z+2.65-7=08.25-2.7z-7=01.25-2.7z=0z=-1.25/2.7(Не получилось)