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1x + 13 = 12

1x = 12 - 13

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

1x/1 = -1/1

x = -1

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

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