Respostas

2014-04-19T16:04:36-03:00
3z + 1 = 7z - 3
1 + 3 = 7z - 3z
4 = 4z
 \frac{4}{4} = z
1 = z
2014-04-19T16:12:11-03:00
3z+1= 7z-3
3z-7z=(-3)-(-1)
-4z= -2 (-1)
z= 2/4= 0,5