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    0.8x-10000 = 2.75×√(0.16x)
    0.8×r-10000=2.75×√(0.16r)
    10000-0.8x=2.75×√(0.16x)
    5.3-x=1.7
    x*(x+10^-2)=5.3*10^-9
    x(2x-5)-2(2x-5)=0
    7200=A+A*7.6517
    100000/(1+x)*4.195*25+93642*x/(1+x)*2312.2=1/0.9*(1357.14/(1+x)*4.174*75+93642.86/(1+x)*2312.2)
    x∧2+2x+60
    x+2x+60
    s^2+2s+8=0
    3*x*x+6*x+4=0
    (x^2)/0.2=(10^-9.25)
    sqrt(x*10^-9.25)=10^-5.13
    x*x+81x-182=0
    x^2=1.8*10^-5*(0.2-x)
    (x^2)/(0.2-x)=1.8*10^-5
    (x^2)/(0.2-x)=1.8*10^-5
    (x^2)/(0.2-x)=1.8*10^-5
    x*x*x+4*x*x+5*x+3=0

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