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1x - 3 = 1

1x = 1 + 3

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

1x/1 = 4/1

x = 4

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

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