(9*x^2-9*x+2)/(9*x^2-1)=98/101
    4x+3(100-x)=370
    (x+2）/ln((40.3+2)/(40.3-x))=61
    1/x-3+2=x-4/3-x
    (16/9)*y^2-(80/3)*y+25/9+50/3
    ((9x^2)-9x+2)/((9x^2)-1)=98/101
    (9x^2-9x+2)/9x^2-1=98/101
    2/(d+1)=1/(d+2)
    3X^2-4X+1
    x-3/1+2=3-x/x-4
    2x-5=4-x
    1/2*9.8t^(2)=2
    (1/x^2)e^(-1/x)=1
    a^(2)－40a－5=0
    (4-3/4*x)/sqrt((x-4)^2+(4-(x^2)/4))=((3/4)*x+x/sqrt(16-x^2))/sqrt(x*2+(sqrt(4-x^2/4)-2)^2)
    0.02*(x^6.6)-x+0.98
    （0.001+x）/（0.01-x）（0.1-x）=3.2
    (4-3/4*x)/((x-4)^2+(4-(x^2)/4))=((3/4)*x+x/sqrt(16-x^2))/(x*2+(sqrt(4-x^2/4)-2)^2)
    （0.001+x）/（0.01-x）（0.1-x）
    x*x-10x+16=0

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