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| x+7 |
| x+6 |
| x+9 |
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| x+10 |
| x+9 |
| x+6 |
| x+5 |
| 1 |
| x(x-1) |
| 1 |
| (x-1)(x-2) |
| 1 |
| (x-1991)(x-1992) |
| 1 |
| x |
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| 1×2 |
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| 1×2 |
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| n |
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| (x+3)(x+6) |
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| 3 |
| 2x+18 |
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| 1 |
| x(x-1) |
| 1 |
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| 1 |
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| 1 |
| x |
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