Bonsoir,

a. 3x = 2x + 5

3x-2x = 5

x= 5

b. 4 - 5x = 9x

4= 9x+5x

4 = 14x

x = 14/4

x= 7/2

c. 4x + 2 = x + 11

4x-x= 11-2

3x= 9

x= 9/3 = 3

d. 3x -7 = -2x -9

3x+2x =-9+7

5x = -2

x = -2/5

e. 5x - 1 = 7x - 1

-1+1 = 7x-5x

0 = 2x

x= 0

f. 3x - 2 + x = 6 + 4x

3x+x -4x= 6 +2

 0             8

??une erreur?

g. 7 (x-2) + 4 (x+3) = 0

7x -14 +4x +12 = 0

7x+4x= 14-12

11x = 2

x= 2/11

h. 3(x-4) = 7(2x-1)

3x-12 = 14x -7

-12+7 = 14x -3x

-5 = 11x

x = -5/11

i. x² + 2(x-3) + 3(x-6) + 6(x+4) = x²

x² +2x -6 +3x -18 + 6x +24 = x²

x² -x²  +2x +3x+6x= 6 +18 -24

11x= 0

x= 0

INCOMPLET ⚠️

Bonsoir ! J'ai fait du mieux que j'ai pu, et si jamais tu as besoin d'explications n'hésite pas. Je n'ai pas réussi les derniers je suis désolée

a) 3x = 2x + 5

3x - 2x = 5

x = 5

b) 4 - 5x = 9x

4 = 9x - 5x

4 = 4x

4÷4 = 4x÷4

0 = x

c) 4x + 2 = x + 11

2 - 11 = x - 4x

-9 = -4x

-9÷-4 = -4x÷-4

2.25 = x

d. 3x -7 = -2x -9

3x + 2x = -9 + 7

5x = -2

x = -2÷5

e. 5x - 1 = 7x - 1

1 + (-1) = 7x - 5x

0 = 2x

0÷2 = 2x ÷ 2

0=x

f. 3x - 2 + x = 6 + 4x

3x + x + 4x = 6 + 2

8x = 8

8x ÷ 8 = 8 ÷ 8

x = 0