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Meilleure réponse !
2013-05-26T12:54:37+02:00

7x+5=47

7x+5-5=47-5

7x=42

7x/7=42/7

x=6

 

 

-4x+2=18

-4x+2-2=18-2

-4x=16

4x=16

4x/4=16/4

x=4

 

 

6x-9=21

6x-9+9=21+9

6x=30

6x/6=30/6

x=5

 

-2x-8=2

-2x-8+8=2+8

-2x=10

2x=10

2x/2=10/2

x=5

 

9x+3=7x-11

9x-7x+3=7x-11-7x

2x+3=-11

2x+3-3=-11-3

2x=-14

2x/2=-17/2

x=-7

 

VOIIIIILA !!!!!!

2013-05-26T13:35:49+02:00

7x + 5 = 47 

           =47-5

           =42

           =42/7

           =6

           =7x6 + 5

           =47

 

-4x + 2 = 18

            =18-2

            =16

            =16/(-4)

            = -4

            =-4x(-4) + 2

            =18

 

6x -9 = 21

         =21+9

         =30

          =30/6

          =5

          =6x5 -9

 

-2x - 8 = 2

           =2+8

           =10

           =10/(-2)

            = -5

            =-2x(-5) - 8

            =2

 

je ne trouve pas la dernière réponse désolé.