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    25x2-80x=64
    11.28x^3+40.94x^2-357.80x-3843.43=0
    -1/3x-2/3=-1/4x*x+3/2x+4
    x=lg5000/lg2
    -(x-2.3*10^-6(8/5-2800x)*(29-140000x)2)=0
    x-1≥2x
    50x^2 -x-1=0
    3*1.02^x=1.04^x
    20x^2 -x-1=0
    (-x^2+26*x-160)^2-(16-x)*(x-8)*(20-x)*(x-10)=0
    -7x^2+16x+28=0
    1/8X=12
    x=1*0.5*2*2.3*10^(-6)*((30-140000x)-1)^2*(1+(30-140000x)/50)
    (3x-1)^(2)=(-5)^(2)
    200(x-3)=150(x+3)
    4*x*x+2*x+1=28
    arcsin((a-1)/(a+1))=50
    x^(2)-3=(x-1)^(4)
    0.25x^6+1.25x^4+x^2=100
    16(x-3)^(2)-25=0

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