e^(1/e)=1/(x^(1/x))
    x^(1/x)=1/(e^(1/e))
    2.5*(T-350)=-T+350*50/200
    0=1*8.314*ln（200/50）+1*7/2*8.314*ln(x/350)
    0=1*8.314*ln（200/50）+1*8.314*ln(x/350)
    17x-17x^3=6x^4+6
    5100*(x+61x/71)+7100x=5
    3x-3x^3=x^4+1
    2x-2x^3=x^4+1
    x-x^3=x^4+1
    logx3=1/3
    X/(X+30)=0.4
    X/X+30=0.4
    x^3+2x^2-x+2=0
    13*0.8-2x=4.9
    sqrt(3)x-1. 6sqrt(3)=x+1. 6
    6x-7=9x+8
    (-11/12+3/4)x(-4^2)+(-2 1/3)/3.5
    (5x+1)/2-(6x+2)/4 = 1
    5x+1/2-6x+2/4=1

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