[tex]\frac{2}{\sqrt{2}-1 } +\frac{3}{\sqrt{2} +1} -\frac{7}{3-\sqrt{2} } =\\\\0+\frac{3}{2\sqrt{2} } -\frac{7}{2\sqrt{2} } =\\\\\frac{3\sqrt{2} }{4} -\frac{7\sqrt{2} }{4}=\frac{-4\sqrt{2} }{4}[/tex]
