17xcube -19xsquare +13x -21 from 16xcube + 14xsquare -9x + 15
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(17x³-19x²+13x-21)-(16x³+14x²-9x+15)
17x³-19x²+13x-21-16x³-14x²+9x-15
x³-33x²+22x-31
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