Si quelqu’un peut m’aider svp c’est noter

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3 x - 2 x + 1 = - 2 x + 7 x - 12

x + 2 x - 7 x = - 12 - 1

- 4 x =  11

x = - 11/4

3 x - 18 + 24 x = 9 x - 2

27 x - 9 x = - 2 + 18

16 x = 16

x = 1

4 x /3 + 2 x - 6 - 5 x /7  = 8 x /3 - 3

28 x /21 + 42 x /21 - 126/21 - 15 x /21 =  56 x /21 - 63/21

28 x + 42 x - 15 x - 56 x =  - 63 + 126

- x = 63

x = - 63

3 x /2 + 4/7 - 11 x /6 = 7 /9

378 x / 252 + 63/252 -  462 x /252 = 196/252

378 x - 462 x  = 196 - 63

- 84 x = 133

x = - 133/84 = - 19/12