-81=3(1+4m)

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Solution for -81=3(1+4m) equation: 



-81=3(1+4m)

We move all terms to the left:

-81-(3(1+4m))=0

We add all the numbers together, and all the variables

-(3(4m+1))-81=0



We calculate terms in parentheses: -(3(4m+1)), so:

3(4m+1)

We multiply parentheses

12m+3

Back to the equation:

-(12m+3)



We get rid of parentheses

-12m-3-81=0

We add all the numbers together, and all the variables

-12m-84=0

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

-12m=84

m=84/-12

m=-7

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