x^2+x=240
    x^2+6x=240
    x^2+3x=240
    x^2+4x=240
    x^2+2x=240
    x/5%=500
    x^5%=500
    (300-4/3m)*(1+2.5m%)=300*(1+m%)
    x×lnx
    9x²+150x+275
    5*x*x-8x-2.2
    5*x*x-8x-5.5
    c(6,5)
    25*x*x-40*x-11＝0
    55×7.99+105.6x=160.6×7.98
    10.25=1.91*3.31+b
    10.25=1.91*3.31+b
    16%=24%+r+24%*r
    3x^3+36x^2+82x-36=0
    x+9=26

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