x^x＝e
    3x^2 + 2x - 5
    2x^2 + 3x - 4
    16.3=（（（100x-55）/45）^2）*16.5
    16.3=（（（100x-55）/45）^2）*16.6
    16.3=（（（100x-55）/45）^2）*16.4
    x^2 + 4x + 4 = 0
    sin(x)+cos(x)=0.2
    sin(x)+cos(x)=1/5
    25x^2+80x-272
    -0.25*x^2+4*x-12=1.5
    3^(2*n-1)+9^n=108
     3^x = x^1
     3^x = x^0
     3^x = x^99
     4^x = x^10
     3^x = x^10
    (0.1*x-0.2)/0.02-(x+1)/0.5=3
     4^x = x^9
    3^x=x^9

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