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Réponse :

Explications étape par étape

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Résoudre :

3x + 5 = 4x - 7

5 + 7 = 4x - 3x

12 = x

x = 12

5x/4 = 25/16

x = 25/16 * 4/5

x = 25/5 * 4/16

x = 5 * 1/4

x = 5/4

x^2 + 3 - x = 3x - 1

x^2 - x - 3x + 3 + 1 = 0

x^2 - 4x + 4 = 0

(x - 2)^2 = 0

x - 2 = 0

x = 2

5 - 2x = x

5 = x + 2x

5 = 3x

x = 5/3

1 + 3x/10 = 4 - 2x/5

3x/10 + 4x/10 = 4 - 1

7x/10 = 3

x = 3 * 10/7

x = 30/7

x^7 + 3x - 2 = 7x + 4 + x^7

x^7 - x^7 - 2 - 4 = 7x - 3x

-6 = 4x

x = -6/4

x = -3/2