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
    2x+1/x-2
    x（4-x）=4
    （50-x）（500+20x）=30000
    （50-x）（500+20x）=28000
    0.5x²-2.5x+3=-0.5x+3
    1.75=(1/6)×x^2-17/12×x+2/3
    X - （X ×0.05 ）=80000
    x-x*6%=359700
    x*6%=359700
    x*0.06=369700
    x*0.06=369800

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