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12 x - 11 = 37

12 x = 37 + 11

12 x = 48

x = 4

9 = 7 x - 19

- 7 x = - 19 - 9

- 7 x = - 28

x = 4

2 x+  17 = 5 x + 2

2  x - 5 x = 2 - 17

- 3 x = - 15

x = 5

fais la dernière

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