2x^4+9x^3-9x^2+2=0
    sqrt2sin（2x-π/4）-1
    exp(-(x/83.23206)^0.65237)=0.5
    lnx=(x/2)-1/2
    lnx=x/2+1/2
    lnx=1/2(x)-(1/2)
    lnx=2x-2
    72x^2-(348/5)x+(396/5)
    1999x²-18027x-180=0
    (3/2)^n=85/42
    (4/3)^n=14/3
    x^4-8x^3-2x^2+7x+1=0
    x^4-8x^3-4x^2+6x+1=0
    x^4-8x^3-24x^2+8x+1=0
    X^4－2X^2－4X+4=0
    X^4－2X^2=0
    X^2－1=0
    s^3+3*s^2+2s+1=0
    100*x*222.64/(x*222.64+(1-x)*0.5*335.17)=91.892
    sqrt(9-x)+9*sqrt(8-x)=29

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