bonjour, voici ce que je pense
1) 2x + 3 = x + 5
= 2x - x = 5 - 3
solution est x = 2
2) 3x - 5 = 2x + 9
=3x - 2x = 9 + 5
solution est x = 14
3) 8x - 3 = 4x + 9
= 8x - 4x = 9 + 3
= 4x = 12
solution est x = 3
4) 2x + 2 = 9 - 5x
= 2x + 5x = 9 - 2
= 7x = 7
solution est x = 1
5) 8x - 5 = 6x - 5
= 8x = 6x
= 8x - 6x = 0
= 2x = 0
solution est x = 0
6) 3x - 2 + x = 6 +4x
= 4x - 2 = 6 + 4x
= -2 = 6
solution est impossible !!
bonne chance!
