160/x=200/(x+5)
    -2k^2+32k-139=0
    1/16a^5-3/16a^4-2a^3+3a^2+13a+16=0
    (1/16)a^5-(3/16)a^4-2a^3+3a^2+13a+16=0
    (1/16)a^5-(3-16)a^4-2a^3+3a^2+13a+16=0
    √3cos（2x-π/3）-2sinxcosx
    x^2+2x-3=0
    √3cos（2x-π/3）-2sinxcosx
    3(x+1)-2(x+1)=2x-3
    2(5+2x)=18
    120-4(5+x)=20
    cos(x)=0.473
    5.451*sin(11.871)/11.871+cos(11.871)=x
    5.451*sin(x)/x+cos(x)=1
    0.15X=4.41
    -0.002X²+0.204X=3.26
    cos(x)=1
    5.451*sin(x)/x+cos(x)=1
    5.451*sin(x)/x+cos(x)=-1
    5.451*sin(x)/x+cos(x)=1

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