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1x + 9 = 13

1x = 13 - 9

1x = 4 (divide both sides by 1 to get x)

1x/1 = 4/1

x = 4

| x+9=12 | | x+9=11 | | x+9=10 | | x+8=20 | | x+8=19 | | x+8=18 | | x+8=17 | | x+8=16 | | x+8=15 | | x+8=14 | | x+8=12 | | x+8=11 | | x+8=10 | | x+7=20 |

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