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2x > - x²
x² + 2x > 0
x(x + 2) > 0
x > 0 i x + 2 > 0 lub x < 0 i x + 2 < 0
x > 0 lub x < - 2
2/x < 0 / * x²
2x < 0
x < 0
x < 0 i x < - 2
x < - 2
x ∈ ( -∞ , - 2)