Respostas

2014-07-22T21:50:21-03:00
X.(-5) - 4=21
-5X=25
X= -25/5
X= -5

  • Usuário do Brainly
2014-07-22T23:03:56-03:00
X . (-5) - 4 = 21
-5x = 21 + 4 
- 5x = 25 . (-1)
5x = - 25
x = - 25 : 5
x = - 5