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2x²-6x-2x+6<x²-4x-3x+12
2x²-x²-6x-2x-4x+3x+6-12<0
x²-x-6<0
Δ=25
√Δ=5
x₁=1-5/2=-2
x₂=1+5/2=3
x∈(-2,3)