Réponses

  • Utilisateur Brainly
2013-03-27T15:13:36+01:00

40 + n = 28 + 2n 

n - 2n = 28 - 40 

-1n = -12 

-n = -12

n = 12 

2013-03-27T15:16:19+01:00

40+n=2 x (14+n)

40+n=2*14+2*n

40+n=28+2n

n-2n=28-40

-n=-12

n=12