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