3f^2≤15f
    −4≤m/3
    −2(2−2z)−4(5+3z)>−10
    7(p+4)≤28−p
    −5(y+2)>6+3y
    9+2>=x
    5*(x^2)-4*x<=2
    5*(x^2)-4*x-2<=0
    30×3x+16×5（24-x）≥2100
    5*(x^2)-x-2<=0
    2*(x^2)-x-(8/9)<=3*(x^2)/4
    2*(x^2)-x-(1/2)<=3*(x^2)/4
    2*(x^2)-x-1/2<=3*(x^2)/4
    x^2-x-1/2<=3*(x^2)/4
    2^x-x-1/2<=3*(x^2)/4
    7x+300>=632.5
    35x+(100-x)*5<=2000
    180*(x-2)>2570
    180*(x-2)<2021
    180*(x-2)<2012

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