x^3-2x^2+1=0
    X/(1-X)=0.1
    x^2+6x+7=0
    (x+3)^2+3(x+3)-4=0
    2x^2-x+6=7
    3x^2-8x+4=0
    x(2x-4)=5-8x
    6x^2-x-2=0
    6x2-x-2=0
     （32-2x）（20-x）=570
    3k^2-48^1/2k+4=0
    3k^2-（4*3^1/2）k+4=0
    3k^2-4*3^1/2k+4=0
    12x²-28x+15＝0
    2√2(x-x^3)=x^4+1
    2√2(x-x^3)=x^4-1
    （x-60）/0.75=x
    e^(1/e)=1/(x^(1/x))
    x^(1/x)=1/(e^(1/e))
    2.5*(T-350)=-T+350*50/200

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