Hello,

x + 3 = 5

x = 5 - 3 = 2

x - 6 = 9

x = 9 + 6 = 15

x + 1 = 3

x = 3 - 1 = 2

2x = 5 - x

2x + x = 5

3x = 5

x = 5/3

3x = 3 - 2x

3x + 2x = 3

5x = 3

x = 3/5

4x - 3 = 3x + 2

4x - 3x = 2 + 3

x = 5

9x - 2x + 5 = 5 + 6x - 2

7x + 5 = 3 + 6x

7x - 6x = 3 - 5

x = -2

7x - 3 + 2x = 10 + 8x

9x - 3 = 10 + 8x

9x - 8x = 10 + 3

x = 13