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