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1x + 7 = 15

1x = 15 - 7

1x = 8 (divide both sides by 1 to get x)

1x/1 = 8/1

x = 8

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

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