Réponses

  • Utilisateur Brainly
2014-01-27T18:33:43+01:00
Bonjour,

1)  2[(x+7)+(2x+3)] = 2(3x+10) = 6x+20

2)  2[(x+7)+(2x+3)] = 2(3x+10) = 6x+20

3) 6x+20 = 32
   6x = -20+32
   x = 2

L = x+7 = 2+7 = 9
l = 2x+3 = 4+3 = 7