Question

A. 7x + 4 = 4x – 17
b. 2(5 – 2x) = 3(5 – x)
c. –2x + 5 = –(x + 9)
d. 18 + 7x = 2(3x – 4)
e. 3(2x – 3) – 2(1 – x) – (x + 3) = 0
tentukan nilai x

Answer 1

A. 7x + 4 = 4x - 17
   7x - 4x = -17 - 4
   3x = -21
   x = -21/3 = -7
b. 2(5-2x) = 3(5-x)
  10 - 4x = 15 - 3x
   -4x +3x = 15 - 10
     -x = 5
       x = -5
c. -2x + 5 = -x -9
   -x = -9 -5
   x = 14
d. 18 + 7x = 6x - 8
     7x - 6x = -8 -18
       x = -26
e.  6x - 9 -2+2x -x -3 = 0
     6x +2x - x - 14 = 0
       7x = 14
     x = 2

Answer 2

A) 7x-4x = -17 - 4
3x = -21
x = -7

b) 10 - 4x = 15 - 3x
10 -  15 = -3x + 4x
-5 = x

c) -2x + 5 = -x - 9
-2x + x = -9 - 5
-x = -14 , x=14

d) 18 + 7x = 6x - 8
18 + 8  = 6x - 7x
26 = -x
x = -26

e) 6x - 9 - 2 + 2x - x -3 = 0
7x - 14 = 0
7x = 14
x = 2