2x+1＞3
    （3x+2）/8+（5x-1）/12-（3-7x）/6>-2x
    （3x+2）+（5x-1）/12-（3-7x）/6>-2x
    0.68x
    x-x^3>0
    (4x^3-4x)e^(x^4-2x^2+1)<0
    -x^3+2x^2+2^(-x)<0
    -3x^2+4x-ln2*2^(-x)<0
    -x^3+2x^2+2^(-x)>0
    -3x^2+4x+ln2*2^(-x)>0
    -3x^2+4x-ln2*2^(-x)>0
    (900+4*a)/(1200+3*a)
    5*a^2+596*a-31200>0
    (104+2*a)/(1996+5*a)
    1.75*(1+ (1-0.25)*a/(300+a-(1-0.25)*a) )-1
    a/300>(104+2*a)/(1996+5*a)
    a/300>(104+2*a+a*0.99)/(1996+5*a-a*0.99)
    a/300>(104+2*a+a*0.75)/(1996+5*a-a*0.75)
    (2x-1)÷2-(0.02x+0.05)÷0.05<(0.6x-0.7)÷0.4
    (10000.5-0.8*x)/0.4/x^0.5<-2.75

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