5/7x:3/5x=6/7x;(x-210)
    5/7x:3/5x=6/7x;(x-210)
    (x^4)-(2x^2)-5
    4x-1/x=0
    4X-（3+X）*2=8
    (11/8)a+19/3+(4a/3)
    2X-（10+X）*2=10
    4X-（3+X）*2=8
    44X-（3+X）*2=8
    4X-（10+X）*2=8
    (x-5)(x-6)=(x-8)(x-9)
    1-x-x*0.16-(x+0.16*x)*0.16=0
    x*x+12x-864=0
    64x-4x*x=120
    64x-4x*x=120
    64x-4x*x=120
    64x-4x*x=120
    64x-4x*x=120
    64x-4x*x=120
    64x-4x*x=120

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