x+X6%=359863
    x+X6%=359862
    x+X6%=359861
    x+X6%=359860
    4000/x-30=4000/1.6/x
    x+X6%=359400
    x+X6%=359500
    x+X6%=359600
    x+X6%=359700
    x+X6%=359800
    x+X6%=360000
    4000/x-30=4000/1.6x
    Y^(5/9)
    7600/(x+12.12)+10000/(x)+5100/(x+12.12)=150
    (x-1)(x-2)^2(x-3)^3(x-4)^4
    1+√（1-x＾2）
    25/x（（1+x）^132－1）=4482.6
    (166.5+417.5)/31*x+179/31*(x+15)+64/31(x+30)=1110
    x^4+x^3+2x^2-x=-1
    x^4-x^2=-1

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