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4(4x² + 12x + 9) ≥ 13 - (1 - 16x²)
16x² + 48x + 36 ≥ 13 - 1 + 16x²
48x ≥ 12 - 36
48x ≥ -24 /:48
x ≥ - 0,5
x ∈ < -0,5; +∞)