Respostas

  • Usuário do Brainly
2014-06-16T14:41:02-03:00
X + 3 . (x - 1) - (x - 9) = 16 - 2 . (x - 5)
x + 3x - 3 - x + 9 = 16 - 2x + 10
x + 3x - x + 2x = 16 + 10 + 3 - 9
5x = 20
x = 20/5
x = 4