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x²-3x =(4x²-12x-3)²
x²-3x=4x²(x²-12x-3)-12x(4x²-12x-3)-3(4x²-12x-3)
x²-3x=(4x⁴-48x³-12x²)-(48x³-144x²-36x)-(12x²-36x-9)
x²-3x=4x⁴-96x³+120x²-9x
x²-120x²-3x+9x=4x⁴-96x³
-119 x² +6x =4x⁴-96x³
4x⁴-96x³+119x²-6x=0
x(4x³-96x²+119x-6)=0
x=0 atau