Question

determine x a) 4x-7=8x-2 b)2x+1=4x-7 c)9x+9+3x=15

Answer 1

a) 4x - 7 = 8x - 2
- 7 + 2 = 8x - 4x
-5 = 4x
-5/4 = x

b) 2x + 1 = 4x - 7
+1 + 7 = 4x - 2x
8 = 2x
8/2 = x
4 = x

c) 9x + 9 + 3x = 15
12x = 15 - 9
12x = 6
x = 6/12
x = 1/2

Answer 2

a)   4x - 7 = 8x -2
      4x - 8x = -2 +7
      -4x = 5
         x = 5 / (-4)
         x = - 5/4

b)   2x + 1 = 4x -7
      2x - 4x = -7 -1
      -2x = -8
       x = (-8) / (-2)
       x = 4

c)   9x +9 + 3x = 15
      12x = 15 - 9
      12x = 6
      x = 6 / 12
      x = 1 / 2