(x²+3x+2)²-8(x²+3x)-4
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=x⁴+9x²+4-8x²-24x-4
=x⁴+9x²-8x²-24x+4-4
=> x⁴+x²-24x
=x⁴+9x²-8x²-24x+4-4
=> x⁴+x²-24x
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