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Sagot :

bonjour

Résous l’équation

A) -3x+2=3x+14

2 - 14 = 3x + 3x

-12 = 6x

-12/6 = x

x = -2

B) 2a+ 7= a-3

2a - a = -3 - 7

a = -10

C) 12-(5x-9)=3(4x+3)

12 - 5x + 9 = 12x + 9

12 + 9 - 9 = 12x + 5x

12 = 17x

12/17 = x

x = 12/17

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