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W(x)=(x-5)(x³-2x²+2x+3x²-6x+6)
W(x)=(x-5)(x³+x²-4x+6)
W(x)=x⁴+x³-4x²+6x-5x³-5x²+20x-35
W(x)=x⁴-4x³-9x²+26x-35