Respostas

A melhor resposta!
2014-08-02T17:51:15-03:00
30+5t=80
5t=80-30
5t=50
t=50/5=10
1 5 1
2014-08-02T17:51:53-03:00
80=30+5t
-5t=30-80
-5t= -50  .(-1)
5t=50
t=50/5
t=10

Espero ter ajudado !