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1. x + (x + 1) + (x + 2) = 20
2. (2x + 1) + (2x + 3) = 18
3. 2x + (2x + 2) + (2x + 4) = 26
4. x + (x + 1) = 16
5. x + (x + 1) + (x + 2) = 20
6. x + (x + 1) + (x + 2) + (x + 3) = 20
7. (2x + 1) + (2x + 3) = 18
8. 2x + (2x + 2) + (2x + 4) = 26
9. 3x + 3(x + 1) + 3(x + 2) = 84
10. 5x + 5(x + 1) + 5(x + 2) = 115
11. 2x + 3x + 4x + 5x = 54
12. x/2 + x/3 + x/4 + x/5 = 345