-81=-(1-7m)+3m

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Solution for -81=-(1-7m)+3m equation: 



-81=-(1-7m)+3m

We move all terms to the left:

-81-(-(1-7m)+3m)=0

We add all the numbers together, and all the variables

-(-(-7m+1)+3m)-81=0



We calculate terms in parentheses: -(-(-7m+1)+3m), so:

-(-7m+1)+3m

We add all the numbers together, and all the variables

3m-(-7m+1)

We get rid of parentheses

3m+7m-1

We add all the numbers together, and all the variables

10m-1

Back to the equation:

-(10m-1)



We get rid of parentheses

-10m+1-81=0

We add all the numbers together, and all the variables

-10m-80=0

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

-10m=80

m=80/-10

m=-8

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