Question 715191

{{{-x^-4 =(-x)^-4}}}


{{{-1/x^4 =1/(-x)^4}}}


{{{-1/x^4 =1/x^4}}}....since you have {{{1/x^4}}} on both sides, and left side is negative, there is no {{{x}}} value that will make it true; so, no solution exist