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1x + 9 = 8

1x = 8 - 9

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

1x/1 = -1/1

x = -1

| 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 | | x+7=19 | | x+7=18 | | x+7=17 | | x+7=16 | | x+7=15 |

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