Respuestas

2013-05-29T22:34:23+02:00
a) 4 - (5x - 4) = 3x
    4 - 5x  + 4 = 3x
    8 = 3x + 5x
    8 = 8x
    x = 1

b) 7x + 10 = 5 - (2- 6x)
    7x + 10 = 5 - 2 +6x
    7x - 6x = 5 - 10
    x = -5

c) 5x - ( 4 - 2x) = 2 - 2x
   5x  - 4  +2x = 2 - 2x
  7x + 2x = 2 + 4
  9x = 6
  x = 6/9
  x = 2/3

d) 1 - 6x = 4x - (3 - 2x)
    1 - 6x = 4x  - 3 + 2x
     1 + 3 = 6x + 6x
      4 =  12x
     x = 4/12
    x = 1/3