x^2-7.4x+12.3=0,X
    x²-5.1x+5.6=0
    sqrt(5)^2-x^2=(5/2)^2-(5/2-x)^2
    135000000=16.7*250*x*(455-x/2)
    X2=25
    x²-2X-100=0
    4X²-2X-1=0
    -0.0045x+lnx=ln2.2222222
    2×k^4+6×k^3+24×k^2+96k+256=256
    2×k^4+6×k^3+24×k^2+96k+256=255
    sink=cosk
    sink=0.7
    sink=2
    sinm=2
    6-m=m
    j=j
    k+k=k
    6k-k=4k
    9+k=14
    k^0=1

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