1.0000000001^x =2
    x+sqrt(x)=5
    x^2+x=5
    x^2+x=5
    0.357-0.0127x=0.067x^2
    2x/2-x
    x^5+3x^2-2x-3=0
    2.25*（x-20）=x/ln（100/（120-x))
    2a^2+5a+1=0
    144/25+（9216/125）^2=x^2
    144/25+9216/125=x^2
    arctan(0.6*x/(1-0.5*x*x))=90
    16+144/25+x^2=256/25+5/32x+x^2
    16+144/25x^2=256/25+5/32x+x^2
    （n+5）^2+2^2=（n+1）^2+7^2
    5^2+（m-2）^2=1+（m-7）^2
    x*x*(0.01*x*x+1）*(0.25*x*x+1）=100
    x^2+（48/x）^2=100
    x^2+（x/48）^2=100
    x*x-3x-1=0

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