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1x + 7 = 12

1x = 12 - 7

1x = 5 (divide both sides by 1 to get x)

1x/1 = 5/1

x = 5

| x+7=11 | | x+7=10 | | x+6=20 | | x+6=19 | | x+6=18 | | x+6=17 | | x+6=16 | | x+6=15 | | x+6=14 | | x+6=13 | | x+6=12 | | x+6=11 | | x+6=10 | | x+5=20 |

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