21=m+28

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Solution for 21=m+28 equation: 



21=m+28

We move all terms to the left:

21-(m+28)=0

We get rid of parentheses

-m-28+21=0

We add all the numbers together, and all the variables

-1m-7=0

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

-m=7

m=7/-1

m=-7

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