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1x - 4 = 16

1x = 16 + 4

1x = 20 (divide both sides by 1 to get x)

1x/1 = 20/1

x = 20

| x-4=15 | | x-4=14 | | x-4=13 | | x-4=12 | | x-4=11 | | x-4=10 | | x-4=9 | | x-4=8 | | x-4=7 | | x-4=6 | | x-4=5 | | x-4=4 | | x-4=3 | | x-4=2 | | x-4=1 | | x-3=20 | | x-3=19 | | x-3=18 | | x-3=17 | | x-3=16 | | x-3=15 | | x-3=14 | | x-3=13 | | x-3=12 | | x-3=11 | | x-3=10 | | x-3=9 | | x-3=8 | | x-3=7 | | x-3=6 | | x-3=4 | | x-3=3 | | x-3=2 | | x-3=1 | | x-2=20 | | x-2=19 | | x-2=18 | | x-2=17 | | x-2=16 | | x-2=15 | | x-2=14 | | x-2=13 | | x-2=12 | | x-2=11 | | x-2=10 | | x-2=9 | | x-2=8 | | x-2=7 | | x-2=6 | | x-2=5 | | x-2=4 | | x-2=3 | | x-2=2 | | x-2=1 | | x-1=20 | | x-1=19 | | x-1=18 | | x-1=17 | | x-1=16 | | x-1=15 | | x-1=14 | | x-1=13 | | x-1=12 | | x-1=11 | | x-1=10 |

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