Mathematics
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    n^2+n=420
    n^2+n=1000
    4k+(k^2-2)*2+2k+4=0
    x^2-x-6=0
    3*(2x+1)-5*(x^2+x)=-1
    3*(2x-1)-5*x*(x+1)=-1
    x^2-10*x+21=0
    (2x-1)^2-4*(2x-1)+4
    4(x-3)^2=25(x-2)^2
    ㏒(x,x+1)
    9a^4-148a^3+724a^2-1760a+1600=0
    x^2-14.5x+45=0
    x^2-11.2x+31.3=0
    2x^4+9x^3-9x^2+2=0
    2(1+x)^=8.72
    x-(x-800)*0.2=5460
    (x-14249)/x=0.08
    a²+a=600
    (800*x+40)/800=1.5
    c^3+c=2

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