x*84%=1000
    8-(4*sqrt21-4)=(1-(1+sqrt21)/2)x
    sqrt(x^2+44)+sqrt(x^2+12)=16
    6^x-5^x=11
    sinx=（6.3cosx+25）/(6.3tanx+35)
    abs(x-abs(3*x+2))=4
    84sinx=（75+6.3cosx）cosx
    x^2*（0.5x+0.05）=5.61*10^-12
    x^2（0.5x^2+0.05）=5.61*10^-12
    X*X*((0.01*X*X+1)/(X*X+1))^(1/2)=10000
    X*X*((0.01*X*X+1)/(X*X+1))^(1/2)=0
    16*10^3*x^2-125*x+225*10^(-3 )= 0
    16*10^3x^2-125x+225*10^-3 = 0
    16*10^3x^2-125x+225*10^-3=0
    X/2=6000+(x-6000-3500)/2
    X=68708-(1680+17.8%X)
    X=68708-(1753+17.8%X)
    X=70664-(3674+17.8%X)
    X=70664-(2004+17.8%X)
    X=70664-(1879+17.8%X)

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