x^2-3x-10<=0
    (119+x)×0.9≤119
    4x((3x^2)-8x+6)>1.75
    sinx＞tanx
    2x+2-6<3x-3
    x-1<3x+1
    (1/2)x-1<=7-(3/2)x
    (2x+5)/3-1<2-x
    (2x+5)/3<2-x
    x-4/x+2>0
    -x^2+4<4
    m^2＞8
    (x+100)/240-x/280>=6000/10000
    ((1/240)(x+1000000))-x/280<=6000
    ((x+1000000)/240)-x/280<6000
    (x+1000000/240)-x/280<6000
    ((x+1000000)/240)-x/280<=6000
    ((x+1000000)/(280-40))-x/280<=6000
    3x^3+4x+1＞0
    (2+x)/2>=((2x-1)/3)-2

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