84.1= 36.585ln(x) - 8.2313
    50 = 36.585ln(x) - 8.2313
    460/x^2+900/x^3=197.3
    84.1 = 37.587ln(x) - 7.4673
    50 = 37.587ln(x) - 7.4673
    3387*0.562*(794+x-18)=875
    12X +(14000+X)=63000
    （14000+X） +(14000+X)=63000
    （14000+X）/12 +(14000+X)=63000
    （14000+X）/12 +14000+X=63000
    arccosh(0.7)
    -arccosh(0.7)
    （4000÷30）×x+（6000÷30）×（30-x）＝4727.27
    （4000÷21）×x+（6000÷21）×（21-x）＝4727.27
    4000/x
    1/x=34570000000/(1095939)
    3.217x^2+x-0.05=0
    84.1 = 37.589ln(x) - 8.8011
    50 = 37.589ln(x) - 8.8011
    x^10000+10000x=100000000

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