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    2X^2-8X+7=0
    4/(x+2)>x+2
    1/3(x+9)=1/2(14-2x)
    6-3/8x=4-1/8x
    1280*0.41=5.8*10^(-4)*((48-20+90-20)*2*10^(-3)-2x)/((1.2/5.5/100)*20*24*10^(-6))+2x/((1.2/5.5/100/10^(-7)/4/3.14)*20*24*10^(-6))
    kx^2=5 k(625-50x+x^2)=3
    ln1/1-x=4.158
    ln1/1-x=
    ln1/1-x=16.63
    ln1/1-x=-16.63
    20xx+26x-58=0
    x^(2)×1.618x=1000
    x=1*0.5*2.3*2*10^(-6)*((30-140000x)-1)^2*(1+(30-140000x)/10)
    x=1*0.5*2.3*2*10^(-6)*((30-140000x)-1)^2*(1+(30-140000x)/50)
    x=1*0.5*2.3*2*10^(-6)*((30-140000x)-1)^2*(1+(30-140000x)/100)
    x=2*0.5*2.3*2*10^(-6)*((30-140000x)-1)^2*(1+(30-140000x)/100)
    x=2*0.5*2.3*2*10^(-6)*((10-140000x)-1)^2*(1+(10-140000x)/100)
    x^3-3x^2-30x-26=0
    x^2-2505.8x+6370=0
    lnx=-16.63

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