x=cos39
    100*x*222.64/(x*222.64+(1-x)*0.5*335.17)=91.538
    sin(x)=2sin(3x-π/6)
    sinx=0.72
    x=e10
    1000x=10000x
    a=4
    n=5n-4n-0-5+5
    1.5x=0.5x+7
    x=sqrt(-1)
    x=x
    x=2x
    3x+90%x*4=9.6
    16πx=9π(x+5)
    9*(y^3)-20*y+40=16/45
    x×2.89％×3＋x＝10867
    ｛[（x×2.89％）＋x]×2.89％＋x｝×2.89％＝10867
    ｛[（x×2.89％）＋x]×2.89％＋x｝×2.89％＝10867
    a^3-3a^2-16a-30=0
    lgx=1/10

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