Finding coordinates with functions that have high powers

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Am trying to find the coordinates of the points where the tangent is horizontal on this equation:
y = 4 + (x-5)^6
I have worked it to this point with the chain rule
y'=6(x-5)^5
however am unable to find the x coordinates. Any help appreciated thanks =)

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we have $$y'=6(x-5)^5=0$$ if $$x=5$$ to find the find the Point we get $$f(5)=4$$