Bonjour j’ai du mal à résoudre mes équations : a) 3x-2=13+17x b) 2-(x-3)=6x c) 4/5x -8=-1 d) 2.(x-4)+1=6x e) 2/5 x -4=3 f) 2x+6=3x+9

Bonjour,

a)  

3x-2=13+17x

3x = 13 + 17x + 2

3x - 17x = 13 + 2

- 14 x = 15

x = -15/14

b)  

2-(x-3)=6x

2 - x + 3 = 6x

2+3 = 7x

5 = 7x

x = 5/7

c)

4/5x - 8 = -1

4/5x = 7

x = 7 / (4/5)

x = 35/4

d)

2.(x-4)+1=6x

2x-8+1 = 6x

6x-2x = -7

4x = -7

x = -7/4

e)

2/5 x -4=3

2/5x = 3+4

2/5x = 7

x = 35/2

f)

2x+6=3x+9

2x = 3x + 3

-x = 3

x = -3

Bonne journée ^^