21=2-m

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Solution for 21=2-m equation: 



21=2-m

We move all terms to the left:

21-(2-m)=0

We add all the numbers together, and all the variables

-(-1m+2)+21=0

We get rid of parentheses

1m-2+21=0

We add all the numbers together, and all the variables

m+19=0

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

m=-19

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