Respostas

2014-08-21T19:27:05-03:00
A)3x=-7+x
3x-x=-7
2x=-7
x=-7/2
x=-3,5

b)2t+1=-8
2t=-8-1
2t=-9
t=-9/2
t=-4,5

c)17x-1=15x+3
17x-15x=3+1
2x=4
x=4/2
x=2
1 5 1