(2x+1)/3>x-1
    3(x-2)>x-4
    (1440-x)/60+x/80<12
    1560≥30y+2000-50y
    30x+18*(2x+4)>699
    -sqrt(5)*t^2/5 -sqrt(5)*t/2<60t/7
    -sqrt(5)*t^2/5 -sqrt(5)*t/2>120t/7
    -sqrt(5)*t^2/5 -sqrt(5)*t/2>120/7
    -sqrt(5)*t^2/5 -sqrt(5)*t/2<=120/7
    -sqrt(5)*t^2/5 -sqrt(5)*t/2<120/7
    6x＋3≥42－9
    x*x*x+9*x*x+6<0
    x*x-3*x+4>0
    0.8*x*x-76*x<100
    0.0013x≥0.0065x−0.0052
    (2x-4)/3≥(x+3)/4
    4(x−6)≤3(1+3x)+13
    (x+3)/2≤3
    (2x-1)/3≥(-x+4)/2
    3x−7>3−x

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