x㏑x
    4-4(1+a)
    X^2-2X
    X^2-2X-1
    10x+10(100+x)=9000
    X（69－2x－1）＝600
    2.4x=21600
    2.4（x+1000+10x-100x-x^2）=21600
    (3x-2)^3=343
    (3x-2)^3=9343
    x-xlnx
    asin(x)=-x+1/x
    sin(x)=-x+1/x
    3x^3=-81
    16x^2-49=0
    sin(x)=(x-sqrt(2))^2
    x^(1/x)=1.1
    X^2+2X-8
    0.08x²+0.9 x=99
    （100-2X）(80-x) =608

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