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    -x=lg(3.8^-0.5*10^-11)
    x=-lg(3.8^-0.5*10^-11)
    18.2591(x-20)=291.47
    x=-lg(10^-14/(3.8^0.5*10^-3))
    14.60728(x-20)=291.47
    x/(50-x)=10^-0.24
    x/(50-x)=10^-0.25
    x/(50-x)=10^0.25
    46206=(700*81-x)*0.85+26*81
    12n^2-240n+2820=0
    (12.5*X*1.67*.4)/(1-12.5*X*1.67*.4)=30%
    12t = 80 + 0.4t*t
    60÷x=90÷(x+3)
    3000÷x-15=3000÷(1.25x)
    3000÷x-15=3000÷1.25x
    3000/x×1.2=2700/(35-x)
    128+128(x+1)+128(x+1)^2=608
    350(1+x)^2 =504
    350(1+x)^2=499.5
    2(x+1)+2(x+1)^2=7.5

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