Respuesta :

0.4x + 0.28 = 0.6x - 4.2
0.4 x - 0.6x = - 4.2 - 0.28
- 0.2x = -4.48
x = 22.4
0.4x + 0.28 = 0.6x - 4.2
0.4 x - 0.6x = - 4.2 - 0.28
- 0.2x = -4.48
x = 22.4