0<(15.63+5+x)/2
    10<(15.63+5+x)/2
    2x<(15.62+5+x)/2
    6.3%=(208/X)^(1/7) - 1
    abs(1-3x/(x-2))<2
    abs(1-3x/x-2)<2
    (3323+200x) * 150+7（36-x）
    2/(F+3)<1/2
    10000*0.0175^n>10000
    800z>=1200(50-z)
    1500x+260(100+30-x)<=58600
    80x+50(50-x)<=3000
    a^2+1>a
    4+K^3-3K^2>0
    （30-x)+x+（25-x）
    (m+3)^2-4m-4>0
    （2m+1）^2-(4m^2-4)>=0
    （2m+1）^2-(4m^2-4)
    x>（100-x）÷3
    3x>100-x

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