Réponse :

Explications étape par étape

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Résoudre les équations :

48 - 5x = 25x + 8

48 - 8 = 25x + 5x

40 = 30x

x = 40/30

x = 4/3

3x + 5 = 2x - 17

3x - 2x = -17 - 5

x = -22

x/3 + 7 = x/6 + 9

2x/6 - x/6 = 9 - 7

x/6 = 2

x = 2 * 6

x = 12

4,3x + 15 = 5,7x + 36

5,7x - 4,3x = 15 - 36

1,4x = -21

x = -21/1,4

x = -15

Exercice 9 :

2(3 - x) + 4(x - 2) = 0

6 - 2x + 4x - 8 = 0

2x - 2 = 0

2x = 2

x = 2/2

x = 1

(1 - x) - (3 + x) = 7

1 - x - 3 - x = 7

-2x = 7 + 2

2x = -9

x = -9/2

3x - 2(x - 4) = 5 + 4(1 - 2x)

3x - 2x + 8 = 5 + 4 - 8x

x + 8 = 9 - 8x

x + 8x = 9 - 8

9x = 1

x = 1/9

x(3x - 1) - 3x(x + 4) = 0

3x^2 - x - 3x^2 - 12x = 0

-13x = 0

x = 0