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bonjour

2 x +2 = 1 8

2 x = 16

x = 8

4 x + 3 = 10

4 x =  7

x = 7 /4

x /2 = 45 /3

3 x  = 90

x = 30

2 x - 1 > x + 3

2 x - x >  4

x >  4

x + 1  ≤ 4 x - 14

x - 4 x ≤ - 14 - 1

- 3 x ≤ - 15

x ≥ 5

x  - 8 < 0

x < 8

- 2 x + 1 ≤  14

- 2 x ≤  13

x  ≥  - 13/2

1.1 x =  22 000

x = 20 000

0.8 x = 100

x = 125

2 x + 10  < 30