10x^2-9x+2=0
    e^(-x) = sin(x)
    26.6667*(x-2)+53.3333*(x-2.66667)+252.3153*(x-9.237771)+435.806*(x-10.9839) = 218.8708*(x-11.18777)+1317.371*(x-12.27369)
    26.6667*(x-2)+53.3333*(x-2.66667)+252.3153*(x-9.237771)+435.806*(x-10.9839)=218.8708*(11.18777-x)+1317.371*(12.27369-x)
    -10485=611-(8400-12500)+X
    -10485 = 611 - (8400 - 12500) + X
    85000=X/(1+6%)+X/(1+6%)^2+X/(1+6%)^3+X/(1+6%)^4+X/(1+6%)^5
    85000=X/(1+6%)+X/(1+6%)2+X/(1+6%)3+X/(1+6%)4+X/(1+6%)5
    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)

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