2^6 = x
    2^6
    7x^(2)-5x+1=0
    x^(2)-2x-5=2x+3
    cosa=1/√3
    (3x+2)^21 = 9x*(x+1)
    cosa=1 √3
    (x^2+12x)/(x-3)^2 = 10
    3x^4+2x^2-1=0
    4y=1-y^(2)
    sinx-1/4sin2x=0
    0.000156*x^5+0.0439*x^4+x^2-25072= 0
    （3600+x）/（13000+x）=0.25
    （3600+x）/（13000+x）=0.3
    0.000156*x^5+0.0439*x^4+x^2-1600 = 0
    （3x-4）^(2)=（4x-3）^(2)
    x=11.5*（200.7-100-12*200.7/263.8）/200.7
    （3x-2）^(2)-49=0
    x/(x+2)=0.064
    4.17x^2+(17.3-34.7x)*(111x^2-126x+36)=5.8

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