Respuestas

2012-05-18T05:29:22+02:00

1.-10z-20+10+2z=8z+8-18

2.-10z+10+2z=8z-10

3.-12z+10=8z-10

4.-12z+10-8z+10=0

5.-12z-8z=0

6.-4z=0

7.-z=0