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1x + 4 = 12

1x = 12 - 4

1x = 8 (divide both sides by 1 to get x)

1x/1 = 8/1

x = 8

| x+4=11 | | x+4=10 | | x+3=20 | | x+3=19 | | x+3=18 | | x+3=17 | | x+3=16 | | x+3=15 | | x+3=14 | | x+3=13 | | x+3=12 | | x+3=11 | | x+3=10 | | x+2=20 |

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