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