4－x²＜0
    -x^2+2x+1>0
    -t²＋t＋0.25≤0
    -x^2+x+2<=x/x^2+1
    -x^2+x<=x/x^2+1
    -x^2+x+1<=x/x^2+1
    x<18<2x
    2000-50n≥4.125√n
    3t^2-2t>14sqrt(3)-63
    3t^2-2t>14√3-63
    3t^2-2t>14√3-63
    0.9^x<1/3
    -x²-4x-8≥0
    x²-9>0
    x^4+x>=0
    5.076*10^(-8)x^4+20x>=18000+1522.8*10^-8
    5.076*10^(-8)x^4+20x>=6012+1522.8*10^-8
    v^2 + 9v - 7110 > 0
    log1/2(2x+3)>log1/8(5x-6)^3
    log1/2(2x+3)

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