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A. x3 - 6x2 + 15x - 20 +15x-1 - 6x-2 + x-3
B. x3 + 6x2 + 15x +15x-1 + 6x-2 + x-3
C. x3 + 6x2 + 15x + 20 +15x-1 + 6x-2 + x-3
D. x3 + 6x2 - 15x + 20 -15x-1 + 6x-2 - x-3
Answer: C
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A. 
B. 
C. 
D. 
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A. 0
B. 
C. 2?
D. ?
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A. x = -9 B. -9y = 1 C. -9x = 1 D. y = -9