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
    28905*(1+x)^5 = 48152
    28905*(1+x)^5 = 55851
    28905*(1+x)^5 = 63550
    28905*(1+x)^5 = 48530
    28905*(1+x)^5 = 56380
    28905*(1+x)^5 = 64230
    -4114150+3000000-450000+x-x*10%/4=300000
    343848*(1+x)^4=418719
    19985*（1+x）^4=28905
    1/(x+3)=1/(x+2) + 1/(x+1) +1
    1/x+3 = 1/x+2 + 1/x+1 +1

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