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
    5.6÷70%X=5%
    X+15%X=3.22
    x²-1127x+124372＝0
    x*e^2x=3
    55×7.99+105.6×7.94=160.6x
    (65670-x）*0.06+x=17937.4
    (65670-x）X0.06+x=17937.4
    55×7.99+105.6×7.97=160.6x
    55×7.99+105.6×7.96=160.6x
    55×7.99+105.6×7.95=160.6x

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