(i)
12x+ 7 = 6x + 27
12x-6x = 27-7
6x = 20
x = 20/6 =10/3 = 3.33
(ii)
4x + 74 = 9x = +14
4x - 9x = 14 -74
-5x = -60
x = -60/ -5 = 12.
(iii)
12x -14 = 9x -1
12x-9x = -1 +14
3x = 13
x = 13/3
(iv) 3x + 35 = 13x -45
3x -13x = -45 - 35
- 10x = - 80
x = -80/-10= 8
(v)
6x -1 = 16x -121
6x -16x =-121+1
-10x = -120
x = -120/-10 = 12
(vii)
10 + 9x = 42 + x
9x - x = 42 -10
8x = 32
x = 32/8 =4
