Respostas

2013-10-08T01:46:53-03:00
12+2n= 9n-63-2
2n-9n= -63-2-12
-7n=-77 (-1)
7n=77
n=77/7
n=11
1 5 1
  • Usuário do Brainly
2013-10-08T01:57:41-03:00
12 + 2n = 9n - 63 - 2
2n - 9n = - 63 - 2 - 12
- 7n = - 77 .(-1)
7n = 77
n = 77 / 7
n = 11
2 5 2