a) 2x + 5 = 7 + x
2x - x = 7 - 5
x = 2
b) 3 - 7x = 2x + 21
3 - 21 = 2x + 7x
- 18 = 9x
x = -2
c) 1 - 4x = x + 16
1 - 16 = x + 4x
-15 = 5x
x = - 3
d) 7 - 5x = 2x - 7
7 + 7 = 2x + 5x
14 = 7x
e) 7 - 2x = 5x - 14
7 + 14 = 5x + 2x
21 = 7x
x = 3
f) 9x - 4 = 5x + 8
9x - 5x = 8 + 4
4x = 12
g) 5x - 1 = 8x + 11
5x - 8x = 11 + 1
-3x = 12
x = -4
h) 3x - 1 = 5x + 9
3x - 5x = 9 + 1
-2x = 10
x = -5
i) 6x - 5 = 3x + 7
6x - 3x = 7 + 5
3x = 12
x = 4
