3*(x+4)(x+1)-4*(x²+½)+5≥3-x₂=
3x+12*x+1-4x²+2+5-3-x²=3x+12x-3x2+5-3-x²=11x+4
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3x+12*x+1-4x²+2+5-3-x²=3x+12x-3x2+5-3-x²=11x+4