(0.05-x)^2/x=10^(-4.74)
    (0.05-x)^2/x=10^-4.74
    3x(x+2)=5(x+2)
    x=0.15x+458.62+40209.72+(x*6.72%)
    (0.5-x)^2/x=10^-3.35
    x-2/x-1=x+2/3
    x-2/3-1=x+2/3
    0.781*12800+0.635*x=0.73*(12800+x)
    100*（24.5789-x）/1.0001=0.32
    100*（23.3802-x）/1.0001=0.34
    0.1-x＝5*10^18x^2
    0.1475/x＝0.1289/0.86289
    0.4/100.58＝37.09/x
    0.4÷100.58＝37.09÷x
    （42.309+x）×1.65＝72.528-x+42.309
    x²+2x+5
    8x＋4(1.5x)＝222
    A*A+A=240
    250000+x^2=（2500-x）^2
    25000+x^2=（2500-x）^2

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