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9-3m=-m-(4m+1)

We move all terms to the left:

9-3m-(-m-(4m+1))=0

We calculate terms in parentheses: -(-m-(4m+1)), so:We get rid of parentheses

-m-(4m+1)

We add all the numbers together, and all the variables

-1m-(4m+1)

We get rid of parentheses

-1m-4m-1

We add all the numbers together, and all the variables

-5m-1

Back to the equation:

-(-5m-1)

-3m+5m+1+9=0

We add all the numbers together, and all the variables

2m+10=0

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

2m=-10

m=-10/2

m=-5

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