2x^2+1=3x
    9x^2-(x-1)^2=0
    （x-1)^2=2(x-1)
    x^2-6x+5=0
    4*x^5-12*x^4+2*x^3+3*x^2-5*x-3=0
    x/(x+100)=0.5
    x/(100+x) = 0.1042
    x/(100+x) = 0.0794
    x/(100+x) = 0.0348
    x/(100+x) = 0.0982
    x/(100+x) = 0.0612
    x/(100+x) = 0.0212
    x/(100+x) = 0.1101
    x/(100+x) = 0.0668
    x/(100+x) = 0.0238
    x/(100+x) = 0.0856
    x/(100+x) = 0.0564
    x/(100+x)=0.0213
    x/(x+100)=2.13
    -5 = -0.3x+0.014x^2-0.003x^3

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