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

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



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

We move all terms to the left:

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

We add all the numbers together, and all the variables

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



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

3(-7m+7)

We multiply parentheses

-21m+21

Back to the equation:

-(-21m+21)



We get rid of parentheses

-7m+21m-21+21=0

We add all the numbers together, and all the variables

14m=0

m=0/14

m=0

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