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4x - 5 = 2x + 11
4x - 5 + 5 - 2x = 2x + 11 - 2x + 5
2x = 16
2x/2 = 16/2
x = 8

5x - 10 = x + 10
5x - 10 + 10 - x = x + 10 - x + 10
4x = 20
4x/4 = 20/4
x = 5

4x + 3 = 18 - x
4x + 3 - 3 + x = 18 - x + x - 3
5x = 15
5x/5 = 15/5
x = 3

20 - 2x = 6x - 12
20 - 2x + 2x + 12 = 6x - 12 + 2x + 12
32 = 8x
8x/8 = 32/8
x = 4

4 -2y = 3y - 4
4 - 2y + 2y + 4 = 3y - 4 + 2y + 4
8 = 5y
5y/5 = 8/5
y = 8/5

2x - 1 = 5x - 3
2x - 1 - 2x + 3 = 5x - 3 - 2x + 3
2 = 3x
3x/3 = 2/3
x = 2/3