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x = 10

6x - 20 = 4x

x = 5

x = 6

4x - 12 = 3x - 6

7x - 9 = 3x + 7

x = 7

5x = 3x + 14

x = 8

6x - 12 = 18

x = 4

4x - 12 = x + 12