tanx-x=9.8017
    3:4=0.95:4
    e∧(-10k)+e∧(-7k)+e∧(-3k)=5.85
    e^(-10k)+e^(-7k)+e^(-3k) = 0.15
    x*(500-x)*(640-x)=50000/1.45
    0.0084^2=(0.0006^2)*x^2+(0.001^2)*(1-x)^2+2*0.9*0.0006*0.001*x*(1-x)
    e^(4545454545*x)=5.0955*10^(-46)/x^5
    0.0016^2=(0.001^2)*x^2+(0.002^2)*(1-x)^2+2*0.7*0.001*0.002*x*(1-x)
    3200=（75-X）（115-X）
    0.0016^2=(0.001^2)*x+(0.002^2)*(1-x)^2+2*0.7*0.001*0.002*x*(1-x)
    e^x=1/x^5
    0.084^2=0.0006^2*x^2+0.001^2*(1-x)^2+2*0.9*0.0006*0.001*x*(1-x)
    e^(x/0.22*10^(-9))=5.0955*10^(-46)/x^5
    x^3-12x+16=0
    e^(x/0.22*10^(-9))=5.0955*10^(-46)/(x^5)
    240÷x=270÷1.5x+1
    10^8*e^(-x/(0.22*10^(-9)))+16*10^(-38)/(3.14*x^5)=0
    -10^8*e^(-x/(0.22*10^(-9)))+16*10^(-38)/(3.14*x^5)=0
    cos(x) = x
    -10^8*e^(-x/(0.22*10^(-9)))-5*10^(-21)/37.68*((-2)/x^3+(-2)/(x+8*10^(-9))^3+4/(x+4*10^(-9))^3)=0

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