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

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



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

We move all terms to the left:

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



We calculate terms in parentheses: -(-3(m-7)), so:

-3(m-7)

We multiply parentheses

-3m+21

Back to the equation:

-(-3m+21)



We get rid of parentheses

-3m+3m-21+21=0

We add all the numbers together, and all the variables

=0

m=0/1

m=0

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