7.89x^2-9.257x+3.3138
    √x∧3+2＝2
    c*c+c=210
    43-x =45 x
    455/x =45
    2x/x=5+4x/x
    1/x+x/1=1
    x+1=x
    x/x=2
    [（X+88）/（1-0.3%）]*0.3%
    （X+88）/（1-0.3%）*0.3%
    2x+3x=9
    84.1 = 37.193ln(x) - 7.4623
    50 = 37.193ln(x) - 7.4623
    84.1 = 37.497ln(x) - 7.8621
    50 = 37.497ln(x) - 7.8621
    84.1 = 38.824ln(x) - 5.3477
    50 = 38.824ln(x) - 5.3477
    84.1 = 37.227ln(x) - 8.3103
    50.0 = 37.227ln(x) - 8.3103

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