0.7=(0.33×10.97+n×9.95)/(0.33+n)
    0.7=(0.33×10.97+n×9.95)/0.33+n
    (X-200)*(1-25%)/3000=(X-200-150)*(1-25%)/3000+300
    (X-200)*(1-25%)/3000=(X-200-150)*(1-25%)/3300
    60-（7+x）÷4=56
    -1*2*arctan1-arctan（0.2*w）-arctan（0.0625*w）=-1*4*arctan1
    40÷s^2÷(0.04*s^2+1)÷(0.0625^2*s^2+1)=1
    （X-200）*（1-25%）/3300=(X-150-200)*(1-25%)/3000
    （X-200）*（1-0.25）/3300
    75%-15%-（1+X）/X*10%*80%=0
    84.1 = 36.85ln(x) - 3.6995
    50 = 36.85ln(x) - 3.6995
    x-74除以77-x等于0.5
    84.1 = 36.068ln(x) - 3.7112
    50 = 36.068ln(x) - 3.7112
    84.1 = 36.232ln(x) - 3.822
    50 = 36.232ln(x) - 3.822
    610/1235＝X/（X+10%）
    22*(x-1160)=17*(x-1100)
    0.2264339*x^(5/3)+6.1125*2*x=921600*1.3

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