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(x - 4y)(x + y)
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jhi8
-167
-3
3 - 3x + x2 - x3 = (1 - x)(x2 + 3)
x3 + x2 + 4x + 4 = (x2 + 4)(x + 1)
x2 - 14x + 49(x - 7) (x - 7)