а)0.2t+1.7t-0.54=0.22
1.9t=0.22+0.54
1.9t=0.76
t=0.76:1.9
t=0.4
б)5.6z-2z-0.7z+2.65=7
2.9z=7-2.65
2.9z=4.35
z=4.35:2.9
z=1.5
0,2t+1,7t-0,54=0,22
0,2t+1,7t=0,22+0,54
1,9t=0,76
t=0,4
