7m-21=(m-)

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Solution for 7m-21=(m-) equation: 



7m-21=(m-)

We move all terms to the left:

7m-21-((m-))=0

We add all the numbers together, and all the variables

7m-((+m))-21=0



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

(+m)

We get rid of parentheses

m

Back to the equation:

-(m)



We add all the numbers together, and all the variables

6m-21=0

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

6m=21

m=21/6

m=3+1/2

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