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Sagot :

TEAMCE

Bonjour,

1. Développer et réduire :

  • 2(x - 7) = 2*x - 2*7 = 2x - 14

  • 3(-x + 1) = 3*(-x) + 3*1 = -3x + 3

2. Résoudre l'équation :

7(6 - 2x) - 3(4x + 1) = 0

(7*6 - 7*2x) - 3(4x + 1) = 0

(42 - 14x) - 3(4x + 1) = 0

(42 - 14x) - (3*4x + 3*1) = 0

(42 - 14x) - (12x + 3) = 0

42 - 14x - (12x + 3) = 0

42 - 14x - 12x - 3 = 0

-26x + 39 = 0

-26x = -39

26x = 39

x = 39/26 = 3/2 = 1,5

* = multiplication

Bonne journée

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