120+450x=100+500x
    (1.5x-1)/3-x/0.6=1.5
    x²-3x+2=0
    720X=800*(X-3)+1160
    720X=800*9(X-3)+1160
    -1+2/1+x
    120+500x=800x
    x＾3+x＾2-5x+3=0
    x-x*0.06*0.12=8191.33
    x*2.39=3.34
    （12-0.5x-6）（30+5x）＝200
    arcsinx
    8a^6-72a^4+161a^2-4=0
    （10-x）（100+100x）＝9600
    e^(-5x)=0.5
    0.75^x=0.3
    1.12^x=2
    log(2，x+1/x-1)
    ln(x-1)+x^2-4.5x+2=0
    3^x+(x-2)/(x+1)=0

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