1) 8*(2+Z)/3=4
16+8z=12
8z=12-16
8z=-4
z=-1/2
2) 1,38x+5,744=5,78
1,38x=5,78-5,744
1,38x=0,036
x=0,036÷1,38
x=36/1380
x=3/115
3) 1,11+3,48x=6,52
3,48x=6,52-1,11
3,48x=5,41
x=5,41÷3,48
x=541/348
4) 2,11y-4=7,22
2,11y=7,22+4
2,11y=11,22
y=11,22÷2,11
y=1122/211
y=5 целых 67/211
5) 4,29z-1,29=3
4,29z=3+1,29
4,29z=4,29
z=4,29÷4,29
z=1