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5x^2 8x -12
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| 5x^4 3x^3 0x^2 0x -12
x^2-x+4 |
| 5x^4 -5x^3 20x^2
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0 8x^3 -20x^2 0x
8x^3 -8x^2 32x
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0 -12x^2 -32x -12
-12x^2 12x -48
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0 -44x 36