![(\sqrt[4]{2x -8} )^4 = (-\sqrt[4]{2x + 8} )^4](/tpl/images/0026/3008/20708.png)
![\sqrt[4]{2x - 8} + \sqrt[4]{2x + 8 } = 0](/tpl/images/0026/3008/93f8e.png)
![\sqrt[4]{2x-8} = -\sqrt[4]{2x + 8}](/tpl/images/0026/3008/f58cf.png)
![(\sqrt[4]{2x - 8)} )^4 = (-\sqrt[4]{2x + 8} )^4\\](/tpl/images/0026/3008/65e3e.png)
Which equation shows a valid, practical step in solving?
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