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12x²-x-4+3x³=0
3x²(x+4)-(x+4)=0
(3x²-1)(x+4)=0
(√3x-1)(√3x+1)(x+4)=0
√3x-1=0 ∨ √3x+1=0 ∨ x+4=0
√3x=1 ∨ √3x=-1 ∨ x=-4
x=√3:3 ∨ x=-√3:3 ∨ x=-4
x∈{-4; -√3:3; √3:3}