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    x^3+16.5x^2+30x+10=0
    1sinπx
    58.44x/(58.44x+1000000)=0.2
    216.12x=(216.12+8.7)×8
    8.29x=(x+8.7)×8
    8.29x=(x+8.7)×8
    -x*x-8x+20=0
    (5/6x)=10
    (1/6x)+4=2/3(21-x)
    (5/6x)=10
    (1+x-(1+x)^30)/(-x)=380/7.8
    (1+x-(1+x)^30)/(-x)=380/12
    x×x+x=45
    x×x+x=72
    x×x+x=72
    (0.525W-180)/130=(0.525W-186)/80
    0.616W=0.9404
    0616W=0.9404
    (0.525W-180)/130=(0.525W-186)/80
    0.8w+arctanw=-π

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