Respostas

2013-12-12T14:04:01-02:00
Incognita: z
Resolvendo:
5z-6=z+14
5z-z=14+6
4z=20
z=20/4
z=5
2 3 2
2013-12-12T14:05:49-02:00
5z - 6 = z + 14
5z - z = 14 + 6
4z = 20
z = 20/4
z = 5
2 4 2