Question 1190690
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It critically depends on what do you mean in your post:    {{{3m^(-7)}}}    or    {{{(3m)^(-7)}}}.



As you pronounce your words,  they do not make difference between these cases.



Wording formulas do not work in Math: only mathematical symbols works.


Even do not try to express math formulas in words:  in  99.999%  cases your wording will be  INCORRECT/inADEQUATE.



During thousand years of intensive brainwork,  the humanity developed the language of Mathematical formulas to express mathematical ideas.



Do not neglect it . . .