$$ \begin{aligned} \sqrt{3+\sqrt{3-2 x}+x} &=2 \quad |(-)^{2} \\ 3+\sqrt{3-2 x}+x &=4 \quad |-3-x \\ \sqrt{3-2 x} &=1-x |()^{2} \\ 3-2 x &=(1-x)^{2} \\ 3-2 x &=1-2 x+x^{2} \\ 3 &=1+x^{2} \\ 2 &=x^{2} \\{x_{1 / 2}=\pm }{2} \\ &\text{Probe: } x=-\sqrt{2} \text { ist die Lösung } \end{aligned} $$