84.1 = 37.497ln(x) - 7.8621
    50 = 37.497ln(x) - 7.8621
    84.1 = 38.824ln(x) - 5.3477
    50 = 38.824ln(x) - 5.3477
    84.1 = 37.227ln(x) - 8.3103
    50.0 = 37.227ln(x) - 8.3103
    2=100×（x-216）/（x×1300/100）
    100+2x=(110-18*3)(5.55-0.85x)(6.55-0.85x)/12
    1505.28+376.32*x+40.18*x^2-17/6*x^3=0
    1066.24+266.56*x+33.32*x^2-(17:6)*x^3=0
    x2/1+x
    （x^2）÷（0.1-x） = 0.00002
    （x^2）/（0.1-x） = 0.00002
    （x^2）/（0.1-x）=0.00002
    3x-3=6x/3
    x^2/（0.1-x）=0.00002
    (10-6.5*x+x^2)*(-3.5-x)+10*x-19=0
    (10-6.5*x+x^2)*(-3.5-x)+12*x-19=0
    x^2/（0.1-x）=2*10^-5
    （0.893-x）*600+0.2=200

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