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2^3+a*2^2+b*2-6=0
1+a+b-6=0
8+4a+2b-6=0
a+b=5
4a+2b=-2
a=5-b
4(5-b)+2b=-2
a=5-b
20-4b+2b=-2
a=5-b
-2b=-22 /:(-2)
a=5-b
b=11
a=-6
b=11
W(x)=x^3-6x^2+11x-6