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What is the solution set for this equation?

$$ \sqrt { { m }^{ 2 }-12m+36 } =m-4 $$

$ \left\{ \cfrac { 5 }{ 3 } \right\} $

$ \left\{ 5 \right\} $

$ { 90 }\left\{ 5,8 \right\} $

No solution.