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1x - 1 = 4

1x = 4 + 1

1x = 5 (divide both sides by 1 to get x)

1x/1 = 5/1

x = 5

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

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