0.8x+x=x
    0.8x+x=x
    0.8x+x=x
    0.8x+x=x
    ln(10/x)=83.5467
    2*1.38*(25+273.15)/1.6/10000*㏑（10/x）=11
    0.0399x²-5=70-2x
    100+0.8(y-50)+100+60+80-20-0.05y
    100+0.8(y-50)+100+60+80-20-0.05y
    x/12*7=9997
    8000/(0.32×112+x)+10000/(x)+10000/(x)=150
    8000/(0.12×112+x)+10000/(112×0.2+x)+10000/(x)=150
    7600/(0.12×112+x)+10000/(x)+10000/(x)=150
    7600/(0.12×112+x)+10000/(112×0.2+x)+10000/(112×0.2+x)=150
    7600/(0.12×112+x)+10000/(112×0.2+x)+10000/(x)=150
    7600/(0.12×112+x)+10000/(112×0.2+x)+10000/(x)
    1337*（1+x^2）/（1-x）=1961
    353*（1+x^5）/（1-x）=1961
    502*（1+x^16）/（1-x）=6246
    lgx=0.04

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