Respostas

2014-08-05T19:26:15-03:00
A) 3x - 12 = 0
   3x = +12
   x = 4

B) -x + 9 = 0
   9 = x

C) 2x + 3/4 = 0
2x = 3/4
x = 3/4 : 2
x = 3/8 = 0,375

D) -1/5x - 6 = 0
- 1/5x = 6
x = 6/1 + 1/5
x = 31/5 = 6,2

13 3 13