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x² (16x²+48x+36) +(-24x²-36x)+8=0
16x⁴+48x³+36-24x²-36x+8=0
16x⁴+48x³-24x²-36x+48=0
2(8x⁴+24x³-12x²-18+28 )= 0
8x⁴+24x³-12x²-18+28 = 0