Bonjour pouvez vous m’aidez sur ce petit exo svp

Bonjour,

1) -x = 4-7

x= 3

2)

x= 9-5 = 4

3)

x=12-2 = 10

4)

3x= 0

x= 0

5)

13-5 = 8  =x

6)

x=  11-2 = 9

7)

x= 42/7 =6

Réponse :

bonjour,

7 - x = 4

-x = 4 - 7

-x = -3

x = 3

x + 5 = 9

x = 9-5

x = 4

2 + x = 12

x = 12 -2

x = 10

3x + 2 = 2

3x = 2-2

x = 0

13 = 5 + x

13 - 5 = x

x = 8

2 = 11 - x

2 -11 = x

- 9 = x

x = -9

7x = 42

x = 42/7

x = 6

voila :)