x^2+1/4*x^2=8
    5/4*x^2+2*x+8=2*sqrt(2)
    sqrt(5/4*x^2+2*x+8)=sqrt(x^2+1/4*x)
    30*sqrt(3)+sqrt(2)/2*x=(90-sqrt(2)/2)/sqrt(3)
    30*sqrt(3)+x=(90-x)/sqrt(3)
    30*sqrt(3)-sqrt(3)*x/3=30*sqrt(3)+x
    90*sqrt(3)-sqrt(3)*x=30*sqrt(3)+x
    -10*x^2+60*x-900=0
    =(147+x)/12
    cos7x
    60830649.87+X/1.065*0.065=X
    5000/（1+x）-5000/（1+x）^2=800
    97.5%*95%*X=5050
    ln-x
    x+33+95=157
    4.8+0.9*(x-4.8)=12
    2*x^2-4x-7=0
    X+0.08=(10-X)x0.833
    x^2-8.3x+9.7=0
    (x+1)4

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