यदि \({\text{x}} = {\text{}}\frac{{4{\text{}}\sqrt {42} }}{{\sqrt 7 {\text{}} + {\text{}}\sqrt 6 }}\) तो  \(\frac{{{\text{x}} + {\text{}}2\sqrt 7 {\text{}}}}{{{\text{x}} - {\text{}}2\sqrt 7 }}{\text{}} + {\text{}}\frac{{{\text{x}} + {\text{}}2\sqrt 6 }}{{{\text{x}} - {\text{}}2\sqrt 6 }}\) का मान ज्ञात कीजिये