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(2/5x^4+2/3x^3+5/8x^2+6)+(-4/5x^4+1 /3x^3-1/4x^2-7)?

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  • (2/5x^4+2/3x^3+5/8x^2+6)+(-4/5x^4+1 /3x^3-1/4x^2-7)?


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