(x-9)^2+4=0
    m^-16
    4.32*（25-x）+224.4=（6.48*x+229+50）/1.5
    140x+35x/11＝315
    X*(1+50%)0.8*(1-5%)=x+7
    X*(1+50%)-X*80%-X*80%*5%=7
    （360-x）/（396-x）=610/1235
    X*(1+50%)=X*80%-X*80%*5%-7
    X*50%=X*80%-X*80%*5%-7
    X*50%=X*80%-X*80*5%-7
    X/50%=X*80%-X*80*5%+7
    X/50%=X*80%-X*80*5%-7
    12/x=3x
    x+46/78x=9x-34
    [√（80*x^2+96*x+31）]/(5*x^2+6*x+2)
    lnx=1
    lnx+x=1
    xlnx=1
    x+1=2
    0*cos(x)+1.1000000000000001*sin(x)+0*x+1=0

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