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9x + 1 = 6x + 2
9x - 6x = 2 - 1
3x = 1
x = 1/3
2 )
24x + 7 = 20x + 23
24x - 20x = 23 - 7
4x = 16
x = 4
3 )
15x + 6 = 11x + 8
15x - 11x = 8 - 6
4x = 2
x = 1/2