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Sagot :

Bonjour !

i) 2x + 3 = 5
2x = 2
x = 2/2
x = 1

ii) 3x + 8 = 1
3x = -7
x = -7/3

iii) -5x + 2 = -3
-5x = -5
x = -5/-5
x = 1

iv) -3x -1 = 2
-3x = 3
x = 3/-3
x = -1

Voilà :)
LIDDOULA

Explications étape par étape:

i ) 2x + 3 = 5

2x = 5 - 3

2x = 2

2x/2 = 2/2

x = 1

ii ) 3x + 8 = 1

3x = 1 - 8

3x = -7

3x/3 = -7/3

x = -7/3

iii ) -5x + 2 = -3

-5x = -3 - 2

-5x = -5

-5x/-5 = -5/-5

x = 1

iv ) -3x - 1 = 2

-3x = 2 + 1

-3x = 3

-3x/-3 = 3/-3

x = -1

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