From the sum of 4x^4- 3x^3+6x + 4x^3+4x-3, subtract5x^4-7x^3+6x^2-5x+4
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4x^4-3x^3+6x+4x^3+4x-3
》4x^4-3x^3+4x^3+6x+4x-3
》4x^4+x^3+10x-3
[4x^4+x^3+10x-3] - [5x^4-7x^3+6x^2-5x+4]
》4x^4+x^3+10x-3-5x^4+7x^3-6x^2+5x-4
》4x^4-5x^4+x^3+7x^3-6x^2+10x+5x-3-4
》-x^4+8x^3-6x^2+15x-7
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