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    x^3-5x^2-6x=0
    x=1
    x=2
    1.03X^2+1.84X^1.68=3×9.8
    0.28X^2+1.84X^1.68=3×9.8
    3.311*(x/(x+5100)-108/5208)=1.997
    (-4+2)x^2-3=-4-1
    1600x^2-1200×2^1/2x+27500 = 0
    1600x^2-1200×2^1/2+27500=0
    a+2+(2-a/5)
    a+2+2-a/5
    x+√3x=4
    -x^5+10/3(x^3)
    (28-x)(10-x)=243
    (28-x)(10-x)=243
    (28-x)(10-x)243
    x*0.09+256000=296000
    x*0.09+256000=29600
    3+3x=5x
    0.5x-100=300

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