1./128 + 49) - x = 28
2.x - (133 + 75) = 32
3.145 - (x + 45) = 50
4.(39 + x) - 27 = 22
5.500 - (120 - x) = 479-99
6.220 + (x - 120) =997 -736
7.472 - (z - 444) = 302
8.6x + 131 = 437
9.490 - y. 7 = 350
10. k: 16 - 109 = 231
11.8. (x - 7) = 1080
12. (k + 11): 23 = 27
13. 900 : (210 +x) =36
14.40 + x: 70 = 54
15. 142 - (123 - x) + 14 =111
16. 67 - 36 : x = 55
17. 24 : (x + 2) = 60 : 15
18.17 + 6.(x - 5) = 47
19.40 – 3. (x + 2) = 10
20.2. (x - 12) +19 = 19
21.63: (2x - 1) = 21: 3