Respuestas

  • Usuario de Brainly
2013-05-20T21:48:11+02:00
1) 5 + x - 3 = - 20 +4x + 15
5 - 3 + 20 - 15 = 4x - x
7 = 3x
7/3 = x

2) 4x - 2x = 5x + 20
4x - 2x - 5x = 20
- 3x = 20
x = 20 / - 3
x = - 20/3

3) 2x + 8 = 10 -x
2x + x = 10 - 8
3x = 2
x = 2/3

espero que te sirva, salu2!!!!