x*1.3=3.6
    xx+21x+99=0
    x*x=1771
    x/lnx=(64/ln64)^2
    x=64/ln64
    x/(3*x/4+3)=-√3
    84.1 = 35.137ln(x) - 3.5731
    50 = 35.137ln(x) - 3.5731
    25/256*x^3+x-2=0
    lgt＝4.16
    n^2-n-306=0
    12000=1500*(1-(1+16%/12)^(-12n))
    -0.2136x^2+3.0432x-10.1458=0
    145000000=13.8×200×X×（460-X/2）
    x*x=2.6*（1-x）*（3-x）
    x/(2000+x) = 20%
    (x-1)^2=(1+2x)/(1-2x)
    2446*0.562*794/(794+x-18)=669
    (32-x)(20+5x)=900
    （80-x）*（20+2x）=2800

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