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
    99X^5+66X^2-23X+51=188
    (ln(72/(247*x))*x^2)/(ln(324/(493*(1-x)))*(1-x)^2)=1
    999+(x-1)^3-114x=1145 1234567 7654321 114514+1919810

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