x^5+2x^4+3x^3-2x^2+x-5
=(x^5-x^4)+3(x^4-x^3)+6(x^3-x^2)+4(x^2-x)+5(x-1)
=(x-1)(x^4+3x^3+6x^2+4x+5)
x^5+2x^4+3x^3-2x^2+x-5
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