Respostas

  • Usuário do Brainly
2014-05-29T16:02:41-03:00
3x -12 = -1 -3x +1 
3x + 3x = 12 +1 -1 
6x = 12 
x = 12/6 
x = 2
2014-05-29T16:03:53-03:00
3x-12-1+3x+1= 
3x+3x=12+1-1
6x=12
x=12/6
x=2