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1x + 4 = 16

1x = 16 - 4

1x = 12 (divide both sides by 1 to get x)

1x/1 = 12/1

x = 12

| x+4=15 | | x+4=14 | | x+4=13 | | x+4=12 | | x+4=11 | | x+4=10 | | 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 |

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