Mathematics
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    -18<-15x^2+21x
    6x-16<-x^2
    8x^2<-14x-5
    7x-49<-20x^2
    -32x-40<6x^2
    16x<4x^2+15
    3x^2+36x+81<0
    -40<15x^2+55x
    20000-(3500+20000x) ≥0
    12000-(3500+12000x) ≥0
    8000-(3500+8000x) ≥0
    x/4+120/x<26.2
    4000-(3500+4000x)≥0
    10000×50%×80%-(3500+yx)≥0
    4m×m+8m-16>0
    36x<-5x^2+32
    -4x^2+32x-48<0
    -34x+24<-12x^2
    6x^2<15x+21
    2x^2-25x<-63

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