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x⁴+2·x⁴·3+9 + (3x²)²-4 - [(2x)³+3·(2x)²·(-2)+3·2x·(-2)²+(-2)³]
x⁴+6x⁴+9+9x⁴-4 - [8x³-24x²+24x-8]
16x⁴+5-8x³+24x²-24x+8
16x⁴-8x³+24x²-24x+13