y*y-5y-1=-828
    y*y-5y-1=-828373
    x / (1-x)² = 2.4 × 10^-18
    (16-3x)(160+120x)=3640
    p^2+(p^2-2p)^2+(3-p)^2+(-p^2+2p+3)^2=18
    y*y-5y-1=-7
    2p^4+16p^2+12p-9=0
    （-1-2lnx）/x＾3=0
    x+1.5(150-x)=200
    x+1=2
    X-10/10-1.1x-12/12=10%
    x²－120x＋464＝0
    x2－120x＋464＝0
    x2
    1+i*i
    i
    x
    t^2+t+1=0
    1/n+n-1/n+1+n-1/n²+n＝1
    x²＋x＝-1

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