(-4/5)*(1-x-2x^2) + (1/3)*(2-x^2) + 1/15*(2+3x-4x^2) = x+x^2(-4/5)*(1-x-2x^2) + (1/3)*(2-x^2) + 1/15*(2+3x-4x^2) = x+x^2

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