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3x - 15 = 6

3x = 6 + 15

3x = 21 (divide both sides by 3 to get x)

3x/3 = 21/3

x = 7

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

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