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2x + 1 = 3

2x = 3 - 1

2x = 2 (divide both sides by 2 to get x)

2x/2 = 2/2

x = 1

| (x+6)/2=8 | | 3x-2=8 | | 9x-3=6 | | x+8=13 | | 12+x=5 | | 4x-2=12 | | 6x-2=14 | | 2x+10=12 | | 3x+2=18 |

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