-2m-21-4(m-3)=6m-(8m-9)-9m+7

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Solution for -2m-21-4(m-3)=6m-(8m-9)-9m+7 equation: 



-2m-21-4(m-3)=6m-(8m-9)-9m+7

We move all terms to the left:

-2m-21-4(m-3)-(6m-(8m-9)-9m+7)=0

We multiply parentheses

-2m-4m-(6m-(8m-9)-9m+7)+12-21=0



We calculate terms in parentheses: -(6m-(8m-9)-9m+7), so:

6m-(8m-9)-9m+7

We add all the numbers together, and all the variables

-3m-(8m-9)+7

We get rid of parentheses

-3m-8m+9+7

We add all the numbers together, and all the variables

-11m+16

Back to the equation:

-(-11m+16)



We add all the numbers together, and all the variables

-6m-(-11m+16)-9=0

We get rid of parentheses

-6m+11m-16-9=0

We add all the numbers together, and all the variables

5m-25=0

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

5m=25

m=25/5

m=5

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