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    x/2000=x+15/3200
    (2+x)(200-20x)=700
    (2+x)(200-20x)=700
    x*cos(sqrt(50/x))=50
    116.4+(20-x)*4.3=(88.8+6.5x)/1.5
    73.2+(20-x)*4.3=(88.8+6.5x)/1.5
    500N-N^2=500-N
    36.79 x 12.36 + 81.2 x 4.94 - 59.27 x 2.36
    36.79 x 12.36 + 81.2 x 4.94 - 59.27 x 2.36
    x^2十x^2=625
    x^2十x^2=625
    38x-2x²-120=0
    x=19/x
    101.2+(20-x)*4.3=(189.8+6.5x)/1.5
    144.4+(20-x)*4.3=(154.8+6.5x)/1.5
    sinx =x/10
    3x^2*(16-x)^2+4*21*21*x^2=48*(16-x)^2
    x*x=4
    t^2+36t=144
    t^2+36t

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