Question 763673
The formatter needs me to use "." instead of "," 


{{{2(1/2 x^-0.6) =2(4)}}}

{{{x^-0.6=8}}}


as you pointed out...


{{{ x^(-3/5)=8}}}

then we take reciprocals and write


{{{ x^(3/5)=1/8}}}


{{{x=x^((3/5)(5/3))=(1/8)^(5/3)=(1/2)^5=1/32}}}

:)