7m-21=(m-3)

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Solution for 7m-21=(m-3) equation: 



7m-21=(m-3)

We move all terms to the left:

7m-21-((m-3))=0



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

(m-3)

We get rid of parentheses

m-3

Back to the equation:

-(m-3)



We get rid of parentheses

7m-m+3-21=0

We add all the numbers together, and all the variables

6m-18=0

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

6m=18

m=18/6

m=3

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