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1x + 15 = 13

1x = 13 - 15

1x = -2 (divide both sides by 1 to get x)

1x/1 = -2/1

x = -2

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

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