Mathematics
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    x^2+x-12>0
    (x^2-x-14)/(x^2-3x-4)≤2
    x+5x+25x+250x+2500x≤5600
    x+5x+25x+250x+2500x≤5600 x≤
    x+5x+25x+250x+2500x≤5600 x≤
    (2.78*x)²+(1400+x)²≥2(2.78*x)(1400+x)
    2.78*x/(1400+x)>2
    2.78*x/(1400+x)>1,
    2.78x/(1400+x)>1
    2+3x-2x²>0
    x^2-x-6≥0
    4<5
    x^2-10x<-1
    (25+x)(80000-2000x) ≥25*80000
    216000000≤300×461×420+14.3×200X(455-X÷2)
    216000000≤300×461×420+14.3×200X(355-X÷2)
    x²-x+1/4<0
    3564300≤11.9×1000X(65-X÷2)
    125000000≤11.9×250×X(465-X÷2)
    5>X+1

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