x / 0.9 + (16177777.78 - x) / 0.97 - 17297281.15 = 0
     x / 0.9 + (1617777.78 - x) / 0.97 - 17297281.15 = 0
    -0.000038x^1.5+2.29x^0.5-0.844x+6867=0
    0.22x^3+192.78+445.03＝0
    0.495x^3+114.44x+988.96＝0
    3x240
    x^4+7×x^3+23×x^2+27×x-16=0
    135-2x=75
    2X²+3X+10=0
    56+167x－3x²＝0
    -300+690x-396x^2=0
    x^3-3x+1=0
    -x^3+4x^2+21x-6
    x^3+x-4=0
    x+x*0.06=2400
    (1+x)^2/(1+x)^2
    x(x+0.25)=3.52*0.00001
    x/（x^2+5）=1/4
    x/（x^2+5）=1/5
    x/（x^2+5）=2/9

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