Respostas

2013-11-23T18:03:48-02:00
4 (t-3)=-3(t+7)
4t-12=-3t-21
4t+3t=-21+12
7t=-9
t=-9/7
1 5 1
2013-11-23T18:07:35-02:00
4(t-3)= -3( t-7)
4t-12= -3t + 21
4t+3t= 12+21
7t=33
t=33/7