12.44x+5x^2＝15.48
    12.44x+5x^2
    x+3+1+6=3x+2*3+1*1+0*6+1
    9+0+5+x=3*9+2*0+1*5+x+1
    9+0+5+x=3*9+2*0+1*5+x+1
    x*ln(x/0.15)=0.2261
    x*ln(x/0.15)=0.3595
    [m-80m/(m+120)]/(m+120) = 24%
    x-5%x=7985825
    x*ln(x/0.15)=0.3197
    x*ln(x/0.15)=0.5083
    x-6.5%x=300872.48
    x^2+5x-30＝0
    （x＋5）（1／x-5000）＝300000
    17600/x+10000/（x+22.4）＝150
    7600/x+20000/（x+22.4）＝150
    cosx = sinx
    cosx = sinx
    （40.221+x）×0.8＝40.221+67.242-x
    cosx=1/sinx

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