Respostas

2013-11-23T19:30:10-02:00
(9t - 3 = 2t + 3)/30

90t - 18 = 6t + 45

90t - 6t = 45 + 18

84t = 63

t = 63/84   t = 21/28     t = 3/4
2013-11-23T19:34:19-02:00
9t/3 - 3/5 = 2t/10 + 3/2

MMC nos dois lados.

45t-9/15 = 2t+15/10 (multiplica cruzado)
30t + 30 = 450t - 90
420t=120
t=0.2857