Résoudre l’equations svp pour dm.a finir ce soir

bonjour

a ) 7 x - 13  

    x = 13/7

b ) x - 3 = 12

    x = 12 + 3 = 15

c)  - x /3 = 5

    - x = 15

    x =  - 15

d) 3 x + 10 = 28

   3 x = 28 - 10  

   3 x = 18

   x = 6

e ) 7 - 4 x  = 11

    - 4 x = 11 - 7

   - 4 x = 4

        x = - 1

f) 9 = 2 x + 7

   - 2 x = 7 - 9

   - 2 x = - 2

   x = 1

Bonsoir,

a) 7x = 13

x = 13/7

b) x - 3 = 12

x = 12 + 3

x = 15

c) - x/3 = 5

- x/3 = 15/3

- x = 15

x = - 15

d) 3x + 10 = 28

3x = 28 - 10

3x = 18

x = 18/3

x = 6

e) 7 - 4x = 11

- 4x = 11 - 7

- 4x = 4

x = - 4/4

x = - 1

f) 9 = 2x + 7

2x = 9 - 7

2x = 2

x = 2/2

x = 1

a) 4x + 7 = 2x + 13

4x - 2x = 13 - 7

2x = 6

x = 6/2

x = 3

b) x - 2 = 10 + 5x

x - 5x = 10 + 2

- 4x = 12

x = - 12/4

x = - 3

c) - 3x - 8 = - 7x - 4

- 3x + 7x = - 4 + 8

4x = 4

x = 4/4

x = 1

d) 2t + 5 = 5t + 12

2t - 5t = 12 - 5

- 3t = 7

t = - 7/3

e) 7x - 6 = 6x + 3

7x - 6x = 3 + 6

x = 9

f) 15x = 7x + 4

15x - 7x = 4

8x = 4

x = 4/8

x = 1/4