Réponses

  • carys
  • Modératrice confirmée
2013-01-27T14:22:15+01:00

( 2x + 3 ) + ( x - 7 ) = 5x - ( 3x - 7 )

2x + 3 + x - 7 = 5x - 3x + 7

3x - 4 = 2x + 7

3x - 2x = 7 + 4

x = 11