5x^2/4+x=3
    (5.3-x)/x=4.13
    x+x/2=21
    ((3.5-x)/1.5)^2=0.7*x+1
    0.0791666*x+7.98660*x^3=156
    （1+9.43%）X=42557
    (1000*((1-1.05^-5)/0.05)+1000*(5-(1-1.05^-5)/0.05)/0.05)/(1+0.01*(1-1.05^-5)/0.05)
    14+11.42+46.56+129.01+((2*17.97+10.7*(x+2.8))*(x+2.8)/2)=(85.35*2+38.21x)*x/2
    x-(180-x)=38
    0.7*x+1=(1-x/1.5)^2
    0.7*x+1=((1.5-x)/1.5)^2
    20-6x+3x^2-x^3=0
    21.57+7.65+86.14+97.15+((2*35.71+11.5*(x+1.8))*(x+1.8)/2)=(85.35*2+38.21x)*x/2
    0.7*x+1=((6.5-x)/1.5)^2
    x=sqrt（0.184）
    (10(-1.269856)^2-9(-1.269856)+54)/2((-1.269856)^2+1)=x
    X^2-X=50
    x=sqrt（0.184）/0.184
    X2-X=50
    x=0.097*sqrt（0.184）/0.184

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