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3x + 1 = 18

3x = 18 - 1

3x = 17 (divide both sides by 3 to get x)

3x/3 = 17/3

x = 5.66666666667

| x-3=5 | | 2x-2=8 | | 2x+1=3 | | x-8=2 | | (x+6)/2=8 | | 3x-2=8 | | 9x-3=6 | | x+8=13 | | 12+x=5 | | 4x-2=12 | | 3x=12 | | 6x-2=14 | | 2x+10=12 | | 3x+2=18 |

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