x-(x/200)*30 =1143.69
    x-(x/200)*30 =1073.52
    x-(x/200)*30 =1260.63
    2x+1/x-5>2
    (1-x)^2>0
    x^2>1
    172<=5000*(x-sinx)<=602
    2a^3+3a^2-1<0
    2x=34x
    2a^3-3a^2+1>0
    x*ex/(x^2-1)>1
    (x+3)/(2x-1)<=2 (x+3)/(1-2x)<=2
    (x+3)/(1-2x)<=2
    (x+3)/(2x-1)<2
    -x^2+4x+30>0
    x^2-4x-30>0
    -5t^2+30t-21＞0
    2.6*100000*Q*Q+2.4*100000*Q*Q=20.9
    5/x+1<=3
    2^x(1+xln2)+x<0

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