Réponse :

Explications étape par étape

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2x + 3 = 4

2x + 3 - 3 = 4 - 3

2x = 1

2x/2 = 1/2

x = 1/2

7x + 5 = 8

7x + 5 - 5 = 8 - 5

7x = 3

7x/7 = 3/7

x = 3/7

4x + 3 = 9

4x + 3 - 3 = 9 - 3

4x = 6

4x/4 = 6/4

x = 3/2

12x + 5 = 13

12x + 5 - 5 = 13 - 5

12x = 8

12x/12 = 8/12

x = 2/3

3x + 2 = 6

3x + 2 - 2 = 6 - 2

3x = 4

3x/3 = 4/3

x = 4/3

14x + 1 = 8

14x + 1 - 1 = 8 - 1

14x = 7

14x/14 = 7/14

x = 1/2

10x + 14 = 19

10x + 14 - 14 = 19 - 14

10x = 5

10x/10 = 5/10

x = 1/2

9x + 7 = 28

9x + 7 - 7 = 28 - 7

9x = 21

9x/9 = 21/9

x = 7/3

5x + 3 = 2x + 7

5x - 2x = 7 - 3

3x = 4

x = 4/3

7x + 2 = 3x + 7

7x - 3x = 7 - 2

4x = 5

x = 5/4

4x + 1 = 2x + 4

4x - 2x = 4 - 1

2x = 3

x = 3/2

12x + 3 = 8x + 17

12x - 8x = 17 - 3

4x = 14

x = 14/4

x = 7/2

3x + 2 = x + 5

3x - x = 5 - 2

2x = 3

x = 3/2

4x + 7 = x + 12

4x - x = 12 - 7

3x = 5

x = 5/3

8x + 5 = 4x + 11

8x - 4x = 11 - 5

4x = 6

x = 6/4

x = 3/2

10x + 5 = 4x + 20

10x - 4x = 20 - 5

6x = 15

x = 15/6

x = 5/2