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    y-0.02y=5916
    150(1+x)2=384
    x^5+10x^3+20x=4
    arctanx-arctan(0.1x)=-180
    2cos2x
    6x×2
    x^2-x-1
    x^2-x-1
    X^3cos2/X+1/2
    420x+420x/2080=20
    3x^2+x=216
    256×x×x×x×x-256×x×x×x+92×x×x-32×x-5=0
    x^2-30x+9=1
    tanx=1.04/x
    5=(y^2-4y+5)^0.5+(y^2+2y+10)^0.5
    (x + 2)^0.5 + (x - 1)^0.5 = 5
    (x + 2)^0.5+(x - 1)^0.5 = 5
    4.5÷t=t÷2
    (12-x)÷4=(12-2x)÷3
    (12-x)÷4=(12-2x)÷3

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