Respostas

2013-08-21T09:55:41-03:00
2-2t+1=3t-9-2t ; 3-2t = t-9; 3+9 = 3t; 12=3t; t= 12/3 ; t=4
2013-08-21T12:44:29-03:00
2-2t+1=3t-9-2t
-2t-t=-9-3
-3t=-12 (-)
t=12/3
t=4