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Bonjour

Explications étape par étape

5x = 3x + 3

5x - 3x = 3

2x = 3

x = 3/2

8x = 12x + 4

12x - 8x = -4

4x = -4

x = -4/4

x = -1

4 - 7y = 10y

4 = 10y + 7y

17y = 4

y = 4/17

7x + 1 = -4 - x

7x + x = -4 - 1

8x = -5

x = -5/8

2 + 3x = 7 - 3x

3x + 3x = 7 - 2

6x = 5

x = 5/6

5 + 6x = -x - 9

6x + x = -9 - 5

7x = -14

11x + 3 = 8x + 7

11x - 8x = 7 - 4

3x = 3

x = 3/3

x = 1

5,5x + 1,5 = 9x + 6

9x - 5,5x = 1,5 - 6

3,5x = -4,5

x = -4,5/3,5

x = -9/7

7 - 3,3x = 2x - 9,7

3,3x + 2x = 7 + 9,7

5,3x = 16,7

x = 16,7/5,3

x = 167/53

5,1 - x = -8x + 1,7

8x - x = 1,7 - 5,1

7x = -3,4

x = -3,4/7

x = -34/70

x = -17/35

Exercice 9)

6x = 6x + 1

6x - 6x = 1

0 = 1 solution vide

3n = 0

n = 0 quelque soit n c’est toujours vrai

0y = 0

0 = 0 quelque soit y c’est toujours vrai