Respostas

2013-05-13T18:46:38-03:00


4t - (2t - 5) = 3 - 4(2t + 3)
4t - 2t + 5 = 3 - 8t - 12
2t +5 = -9 - 8t
10t = -14
t = -14/10
t = -7/5

1 5 1
2013-05-13T18:51:42-03:00

4t-2t+5=3-8t-12

2t+5=-9-8t

2t+8t=-9-5

10t=-14

t=-14/10

t= -7

     5

ou 

t= -3.5