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W(x) = 18x³-18x+9x²-9
W(x) = 18x(x²-1)+9(x²-1)
W(x) = (x²-1)(18x+9)
W(x) = 18(x+1/2)(x²-1)
W(x) = 18(x+1)(x+1/2)(x-1)