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