Mathematics
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    900x+1800=1200x
    (x^2-1)(x^2+2x+1)-3
    r^2-7.5^2=（r-3）^2
    (8x+(1.5x*3))*22+2*8*11x=7000
    4m²＝（8-m）²+m²
    5t^-8t+3
    2x=0
    2x=0
    2x=0
    2x=0
    2x=0
    2x=0
    2x=0
    2x=0
    2x=0
    sin2x=0
    sin2x=0
    sin2x=0
    sin2x=0
    sin2x=0

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