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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+9=9 | | x+9=8 | | x+9=7 | | x+9=6 | | x+9=5 | | x+9=4 | | x+9=3 | | x+9=2 | | x+9=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+8=9 | | x+8=8 | | x+8=7 | | x+8=6 | | x+8=5 | | x+8=4 | | x+8=3 | | x+8=2 | | x+8=1 | | x+7=20 | | 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+7=9 | | x+7=8 | | x+7=7 | | x+7=6 | | x+7=5 | | x+7=4 | | x+7=3 | | x+7=2 | | x+7=1 | | 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+6=9 | | x+6=8 | | x+6=7 |

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