Mathematics
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    215/(50035 +x) <97/(25281+x)
    0.34x-1.28≥0
    0.29x^2-6x+12.36≤0
    (x-1)(2-x)^2 (x-3)>0
    (x-1)(2-x)^2 (x-3)>0
    (x-1)(2-x)^2 (x-3)>0
    4x^2-100x-1200>=0
    x^2-25x-300>=0
    2x^2+x-1<=0
    (35-x)/2>0
    -(x/(x-20))>1
    x/(x-20)>1
    x/(x-20)>10
    x/x-20>10
    x+1>2x-1
    x^2-180x+8000>0
    x2-180x+8000>0
    2a+4<-13a
    2a+4<-13a
    x^2+x+20<0

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