-399=-7(1-7m)

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Solution for -399=-7(1-7m) equation: 



-399=-7(1-7m)

We move all terms to the left:

-399-(-7(1-7m))=0

We add all the numbers together, and all the variables

-(-7(-7m+1))-399=0



We calculate terms in parentheses: -(-7(-7m+1)), so:

-7(-7m+1)

We multiply parentheses

49m-7

Back to the equation:

-(49m-7)



We get rid of parentheses

-49m+7-399=0

We add all the numbers together, and all the variables

-49m-392=0

We move all terms containing m to the left, all other terms to the right

-49m=392

m=392/-49

m=-8

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