-450+x-x*8%/4-690=500
    x/ln（x）
    1-2^a/1
    s(s^2+24s+144)=(s+20)((s+12)^2+2s(s+12))
    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

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