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1x + 3 = 16

1x = 16 - 3

1x = 13 (divide both sides by 1 to get x)

1x/1 = 13/1

x = 13

| 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 |

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