5*x^5-23*x^4-176*x^3+320*x^2-1024*x-1024
    5*x^5-23*x^4-176*x^3+320*x^2-1024*x-1024
    x²-2x-3=0
    x=11220×0.05×2.9^2
    x=11220×(0.05-x)×(3-2x)^2
    x=(0.05-x)×(2.55-x)×1738
    (400-(x-20)^2)^(1/2)=-(100-(x-10)^2)^(1/2)+10
    x=11220*(0.05-x)*(2.55-2*x)^2
    7:4=28:x
    7:4=x:28
    0*cos(x)+1.1*sin(x)+0*x+1=0
    3000+x=x/0.15
    -0.24（t-53）=-2.2
    [(220+220+260）*55-x]*0.85=29504.75
    [(220+220+260）-x]*0.85=29504.75
    [（220+220+260）*55-x]*0.9=29504.75
    4x^2=(x-2)(x-1)^2
    x(x+1)^2=2(x-1)^3
    （x-129.055）*10-1-1=2
    73×7.98+87.6x=7.96×160.6

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