Respostas

  • Usuário do Brainly
2014-06-23T16:47:09-03:00
5 . (x + 20 - x) = 20 + 2x
5 . 20 = 20 + 2x
100 = 20 + 2x
20 + 2x = 100
2x = 100 - 20
2x = 80
x = 80/2
x = 40
2014-06-23T16:55:35-03:00
5(x+20-x)=20+2x
5x+100-5x=20+2x
2x+20=100
2x=100-20
x=80÷2
x=40