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1x + 4 = 20

1x = 20 - 4

1x = 16 (divide both sides by 1 to get x)

1x/1 = 16/1

x = 16

| x+4=19 | | x+4=18 | | x+4=17 | | x+4=16 | | 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=5 | | 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 |

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