Respuestas

2013-10-12T21:50:31+02:00
71 + [ - 5 x - 2 x + 3 ] = 25 - [ - 3 x - 14 ]
71 + [ - 7 x + 3 ] = 25 + 3 x + 14
71 - 7 x + 3 = 25 + 3 x + 14
- 7 x - 3 x = 25 + 14 - 71 - 3
- 10 x = - 35
x = - 35 / (-10) = 3,5 o 7/2