4(8x)＞40
    x＋2＞0
    3x－4x＞1
    (184*254+600x)/(x+254)＞200
    (184*254+300x)/(x+254)＞200
    (475+4x)/(x+250)>2
    -4082750+3000000+x-45000-2.5%x>=300000
    17x+12（31-x）<475
    5*(50-(x+2x-10))<=10*(1.5*(2x-10))
    50-2x>30-x
    10n≤12.5(360-n)
    2<0.116r+140.6625/r-3799.14/(r^3)<20
    (1.1*(1-1.1^x)*100)/-0.1>100x+10x^2
    (1.1*(1-1.1^x)*100)/-0.1<100x+10x^2
    0.095r+164.25/r-5279.4645/(r^3)<30
    0.095r+164.25/r-5279.4645/(r^3)<21
    0.095r+164.25/r-5279.4645/(r^3)<19.5
    2<0.095r+164.25/r-5279.4645/(r^3)<19.9
    0.095r+164.25/r-5279.4645/(r^3)<19
    0.095x+164.25/x-5279.4645/(x^3)<20

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