Sstrhsrtj

I have the following code:

documentclass{article}

usepackage{tikz,pgfplots}

    begin{document}

        begin{tikzpicture}[xscale=2]

        @Axes           

        draw (0.05,-0.2) node[left]{textcolor{gray}{O}};  

        draw[thick, color=gray,->] (-1.5,0) -- (3,0) node[right] {textcolor{black}{$x$}};

        draw[thick, color=gray, ->] (0,-1.5) -- (0,5) node[above] {textcolor{black}{$f(x)$}};



        @Plot

        draw [red, thick, domain=-1.2:2.5, samples=100] plot(x, {((x)+1});

        draw [blue, thick, domain=-0.7:2, samples=100] plot(x, {(3-2*(x)});

        @LoS and Labels

        draw[gray, dashed] (2/3,0)--(2/3,5/3);

        node[circle,fill=black,inner sep=0pt,minimum size=3pt,label=below:{$frac{3}{2}$}] (a) at (2/3,0) {};

        node[circle,color=black, fill=white, inner sep=0pt,minimum size=5pt,label=below right:{}] (b) at (2/3,5/3) {};

        end{tikzpicture}

    end{document}

and I want to get a node in the middle of the intersecting line which is a white circle with a black border (a bubble which shows the point is excluded). How can I do this?

Do you just want this?

documentclass[tikz,border=10pt]{standalone}

begin{document}

begin{tikzpicture}[xscale=2]

  draw (0.05,-0.2) node[left, text=gray]{O};

  draw [thick, draw=gray, ->] (-1.5,0) -- (3,0) node[right, black] {$x$};

  draw [thick, draw=gray, ->] (0,-1.5) -- (0,5) node[above, black] {$f(x)$};

  draw [red, thick, domain=-1.2:2.5, samples=100] plot(x, {((x)+1});

  draw [blue, thick, domain=-0.7:2, samples=100] plot(x, {(3-2*(x)});

  draw[gray, dashed] (2/3,0)--(2/3,5/3);

  node[circle,fill=black,inner sep=0pt,minimum size=3pt,label=below:{$frac{3}{2}$}] (a) at (2/3,0) {};

  node[circle,draw=black, fill=white, inner sep=0pt,minimum size=5pt] (b) at (2/3,5/3) {};

end{tikzpicture}

end{document}