Find all solutions on the interval [0,2π)\displaystyle {\left[{0},{2}\pi\right)}. Give exact answers. 

 2cos⁡2x−cos⁡x=1\displaystyle {2}{{\cos}^{{2}}{x}}-{\cos{{x}}}={1} 

Separate multiple solutions with a comma. If there are no solutions please enter, "no solution" exactly.

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