\[\boxed{\mathbf{684\ (684).\ }Еуроки\ - \ ДЗ\ без\ мороки}\]
\[1)\ \left| x^{2} + 7x - 4 \right| = 4\]
\[x^{2} + 7x - 4 = 4\]
\[4)\ x² + \frac{4x^{2}}{|x|} - 12 = 0\]