(5x^6+9x^4-2x^3-3)-(8x^6-8x^5+x^4-4)
+8 x^5 +(9-1) x^4 -2 x^3 -3+4 = -3 x^6 + 8 x^5 + 8 x^4 - 2 x^3 + 1
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