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b) =2x^2-x-6-x^2+1=x^2-x-5
c) =2x^2-x^3+8-4x-x^4-2x^3-3x^2=-x^4-3x^3-x^2-4x+8
d) =x(x^2-5x+6)-x(x^2-x-20)=x^3-5x^2+6x-x^3+x^2+20x=-4x^2+26x