Răspuns :
[tex] \frac{x}{6 \sqrt{2} + 4 } = \frac{6 \sqrt{2} - 4 }{7} = > \\ x = \frac{(6 \sqrt{2} + 4) \times (6 \sqrt{2} - 4) }{7} = > \\ x = \frac{ {(6 \sqrt{2}) }^{2} - {4}^{2} }{7} = > \\ x = \frac{72 - 16}{7} = > \\ x = \frac{56}{7 } = > \\ x = 8[/tex]