x＾4-(5+5)x＾3+(6*5+3)x＾2-(9*5-5)x+3*5=0
    x＾4-9x＾3+27x＾2-31x+12=0
    x＾3-6x＾2+8x=0
    -x＾3+12x＾2-46x+58=0
    x＾3-15x＾2+69x-99=0
    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

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