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bonjour

1 post = 1 exercice

5 n + 104 = - 15 n + 20

5 n + 15 n = 20 - 104

20 n = - 84

n =  - 4.2

programme  1

x

x + 13

8 ( x + 13) = 8 x + 104

8 x + 104  - 3 x

5 x + 104

programme  2

x

3 x

3 x - 4

- 5  ( 3 x - 4 )

= - 15 x + 20

5 x +104 = - 15 x + 20

5 x + 15 x = 20 - 104

20 x =  - 84

x = -  4.2

ils ont choisi  - 4.2

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