x<-10x^2+24
    0<5x^2-25x-30
    32<10x^2+4x
    -15x^2-6<-21x
    -9x-54<-9x^2
    -x^2<4x-5
    8x-8<2x^2
    29x<5x^2+20
    20x^2-4<-16x
    -6<16x^2+28x
    10x^2+42<-44x
    0<-12x^2-27x-15
    20x^2-11x<42
    0<-20x^2-46x-24
    200 >100+10+100-40
    10x >5x+0.5*x+100-2x x=20
    2x+3-x≥4
    x(20-2x)≥42
    10x>5x+0.5*x+100-2x
    0<0.4*e^(-0.4*(x-1))-e^(x-1)<1

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