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Réponse :
bonjour
2 ( 3 x + 4 ) = 7 x + 9
6 x + 8 = 7 x + 9
6 x - 7 x = 9 - 8
- x = 1
x = - 1
Explications étape par étape
Bonjour (* = multiplication)
6x +8 = 7x +9
6x +8 -8 = 7x +9 - 8
6x -7x = 9- 8
-1x = 1
= - 1
6x +8 = 7x +9
6x +8 -8 = 7x +9 - 8
6x -7x = 9- 8
-1x = 1
= - 1