Question

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

Answer 1

1) 0,2t+1,7t-0,54=0,22
1.9t-0.54-0.22=0
1.9t-0.76=0
t=0.76/1.9=0.4

2) 5,6-2z-0,7z+2,65=7
5.6-2.7z+2.65-7=0
8.25-2.7z-7=0
1.25-2.7z=0
z=-1.25/2.7(Не получилось)