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6x⁴ - 9x³ - 24 - 6x³=6x²/: x²
6x² - 9x - 24/x² - 6x=6
6x² - 15x -24/x²=6/:x
6x - 15 + 24/x³=6x
6x - 6x= 15 + 24/x³
0=15 + 24/x³/ x x³
0=15x³ + 24
15x³= 24/ : 15
x³= 24
x =∛ 24
x= 2∛3