164=（（0.021*x^1.85+1603）^0.5）*x^0.84
    x=70900+0.0672x
    x^3+2x^2-1=0
    x*3+2x*2-1=0
    x²-x=870
    28500000=14.3*1000*x*(124-x/2)
    (1.11+x)/(3.85+x)=30%
    200(x+2)=150x*2
    2x+5(30-x)=90
    2x+150-x=90
    x^(x^5)=100
    （440*55-x）*0.9+18*55=21010
    30000*(1+0.02)^x=100000000
    30000*（1+0.1）^x=100000000
    x=74600+0.0672x
    x=74500+0.0672x
    x=74100+0.0672x
    x=75100+0.0672x
    a^3-7a^2+14a-7=0
    x(12-2x)/2=6

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