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-3(x²-4x+4)+4=0
-3x²+12x-8=0
Δ=b²-4ac
Δ=12²-4*(-3)*(-8)
Δ=144-96
Δ=48
√Δ=4√3
x₁=(-12-4√3):2*(-3)=(6+2√3):3
x2=(-12+4√3):2*(-3)=(6-2√3):3