220x^2-596x+121=0
    600000 = 30000*x*490.874*sqrt(1-1/(1+x-0.0003395)^2)*16
    0=t^2-48/27×t- 85/27
    （40-x)(20+2x)=1200
    （10+x）（600-x）＝10000
    600000=30000*x*490.874*sqrt(1-1/(1+x-0.000679)^2)*16
    3a×a+7a=8
    3a×a+7a
    a+2=5
    x(1/340-1/1500)＝0.5
    （16-3X）（160+3X）=3640
    60x-20x^2=-5000
    (x-507000)/x=0.15
    x^3+3x^2+3x+1-2-2-x-1-4-4x-4-x-1
    x^3+3x^2+3x+1-2-2-x-1-4-4x-4-x-1=
    x^3+3x^2+3x+1-2-2-x-1-4-4x-4-x-1=0
    x^3+3x^2+3x+1-2-2-x-1-4-4x-4-x-1=
    x^3+3x^2+3x+1-2-2-x-1-4-4x-4-x-1=
    45.28x^8+50x^7+50x^6=171.3226
    45.25*n^8+50*n^7+50*n^6=171.02

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