bonjour pouvez vous m'aider s'il vous plaît merci d'avance a) 3x+2=14 b) 3x-4=2x+9 c) 5x-4=8-3x d) 3-(5-x)=3-4x e) 2x+5=3x-1 f) 2(5-3x)=6(2x+1) g) 4(3x-2)-10x=2

a) 3x+2=14

3x = 14-2

x=12/3

x=4

b) 3x-4=2x+9

3x - 2x = 9 + 4

x = 13

c) 5x-4=8-3x

5x + 3x = 8 + 4

8x = 12

x = 12/8

x = 3/2

d) 3-(5-x)=3-4x ?

e) 2x+5=3x-1

2x - 3x = -1 -5

-1x = -6

x = -6/-1

=x = 1/6

f) 2(5-3x)=6(2x+1) ?

g) 4(3x-2)-10x=2x-1 ?

h) 3(x+2) -(x-3)=3-4x ?

i) 5x+7=-5+11x​

5x - 11x =5 -7

-6x = -2

x= -2/-6

x= 1/3

Réponse :

Explications étape par étape

a) 3x+2=14

3x = 14 -2

3x = 12

x = 12/3 = 4/1 = 4

b) 3x-4=2x+9

3x - 2x = 9 +4

x = 13

c) 5x-4=8-3x

5x + 3x = 8 +4

8x = 12

x= 12/8 = 3/2

d) 3-(5-x)=3-4x

3 - 5 + x = 3 - 4x

x + 4x = 3 - 3 + 5

5x = 5

x = 5/5 = 1

e) 2x+5=3x-1

2x -  3x = - 1 - 5

x = - 6

f) 2(5-3x)=6(2x+1)

10 - 6x = 12x +6

- 6x - 12x = 6 - 10

-18x = -4

x = -4/-18 = 2/9

g) 4(3x-2)-10x=2x-1

12x - 6 - 10x = 2x - 1

12x - 10x - 2x = -1 +6

x = 5

h) 3(x+2) -(x-3)=3-4x

3x + 6 - x + 3 = 3 - 4x

3x - x + 4x = 3 - 6 - 3

6x = - 6

x = -6/6 = - 1

i) 5x+7=-5+11x​

5x - 11x = - 5 - 7

- 6x = - 12

x = -12/-6 = 2/1 = 2