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2014-08-26T15:57:18-03:00
2t + 3t + 3 - 4 - 3t- 9= - 4
2t - 1 - 9 +4 =0
2t -10 +4=0
2t - 6=0
2t=6
t=6/2
t=3

2 5 2
2014-08-26T16:22:51-03:00
2t+3(t+1)-4-3(t+3)=-4
2t+3t+3-4-3t-9=-4
2t+3t-3t+3-3-4=-4
2t-4=-4
2t= - 4 +4
 2t=0
t=0
1 5 1