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1x + 7 = 20

1x = 20 - 7

1x = 13 (divide both sides by 1 to get x)

1x/1 = 13/1

x = 13

| x+7=19 | | x+7=18 | | x+7=17 | | x+7=16 | | x+7=15 | | x+7=14 | | x+7=13 | | x+7=12 | | 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 |

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