\[\left( 5\sqrt{7} - \sqrt{63} - \sqrt{14} \right) \cdot \sqrt{7} + 7\sqrt{2} =\]
\[= 5\sqrt{7 \cdot 7} - \sqrt{63 \cdot 7} - \sqrt{14 \cdot 7} + 7\sqrt{2} =\]
\[= 5 \cdot 7 - \sqrt{9 \cdot 7^{2}} - 7\sqrt{2} + 7\sqrt{2} =\]
\[= 35 - 3 \cdot 7 = 35 - 21 = 14.\]