lnx=-0.336
    lnx=-1.78
    lnx=-0.022
    lnx=-4.60517
    1.1561*x - 0.0011=0.3
    lnx=-1.089
    474.13*x - 0.0462=10
    474.13*x - 0.0462=4
    10+t/3=t/2
    x+(8000*x^0.85)/3=12.256
    1.2x＝25
    （0.9x-60）×12=(x-60)×10
    x+x*0.06=613
    x+x*0.06=802.4
    x-104=4(x-105)
    100(x-104)=104(x-105)
    X-(X×0.25)=140
    X-（X×0.25）=591
    x+x*0.06=1212.4
    x/2650+(x-0.33x)/891=0.678

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