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