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3 x + 2 = 8

3 x = 6

x = 2

5 x - 2 = 4 x + 8

5 x - 4 x = 8 + 2

x = 10

3 x + 3 = 4 - 4 x

3 x + 4 x = 4 - 3

7 x = 1

x = 1 /7

3 x + 6 - 8 +  4 x = 16 x + 24

7 x - 16 x  = 24 - 6 + 8

- 9 x = 26

x = - 26/9  

Explications étape par étape:

a) 3x + 2 = 8

3x = 8 - 2

3x = 6

x = 6/3

x = 2

b) 5x - 2 = 4x + 8

5x - 4x = 8 + 2

x = 10

c) 3(x + 1) = 4 (1 - x)

3x + 3 = 4 - 4x

3x + 4x = 4 - 3

7x = 1

x = 1/7

d) 3 (x + 2) - 4 (2 - x) = 8 (2x + 3)

3x + 6 - 8 + 4x = 16x + 24

7x - 2 = 16x + 24

7x - 16x = 24 + 2

- 9x = 26

x = -26/9