-21=-6(-3+4m)+3(1+m)

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Solution for -21=-6(-3+4m)+3(1+m) equation: 



-21=-6(-3+4m)+3(1+m)

We move all terms to the left:

-21-(-6(-3+4m)+3(1+m))=0

We add all the numbers together, and all the variables

-(-6(4m-3)+3(m+1))-21=0



We calculate terms in parentheses: -(-6(4m-3)+3(m+1)), so:

-6(4m-3)+3(m+1)

We multiply parentheses

-24m+3m+18+3

We add all the numbers together, and all the variables

-21m+21

Back to the equation:

-(-21m+21)



We get rid of parentheses

21m-21-21=0

We add all the numbers together, and all the variables

21m-42=0

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

21m=42

m=42/21

m=2

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