X+(x^2)/20<=240
    3x^2+6x<0
    16+3y+3≤16-2y+3
    0.5sqrt(9t^2-60t+23)＜t+1
    abs(t-1)＜0.5sqrt(9t^2-6t+23)
    1175.78t^3≥57.675t+4
    abs(x-1)-abs(x+2)<8
    abs(x+2)<5 abs(x-1)+abs(x+2)<5
    10＞600÷4x＞4
    x-3/x+5≤0
    20x+3000<30x
    log(2,3-x)>0
    (40+x)(20-2x)≥637.5
    (40+x)(20-2x)≥528
    (40-(100-x))(20+2(100-x))≥1200
    (40-x)(20+2x)≥1200
    6-3*x<=4*x-8<3*x-3
    x/(-3)<=5/3*x+2
    3*x+1<2*(x+2)
    10x＞7x＋6

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