m^2+2m=120
    x^2-lnx
    3x^2+6x-1=0
    lnk=0.042
    lnk=-0.042
    -8.314*298.15*lnx=103.48
    x^3－3x^2－3x＋7/16＝0
    -8.314*298.15*lnx=103.48
    lnk=-0.042
    lnk=0.042
    √1－cost
    √1－cost
    X+(X*0.05) = 591
    x3+2x2+2x=0
    x／lnx
    x／lne
    9^x=3
    27600+x-x*2.5%
    x/90-1/4=60/2x+0.5
    3^x=x^9

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