findinf Difference (x+7x^2)-(1+3x-X^2)

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(x+7x^2)-(1+3x-X^2)

x(1+3x+x^2) - 7x^2(1+3x+x^2)

x+3x^2-x^3-7x^2-21x^3+7x^4

7x^4-22x^3-4x^2+x

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