21=10+m

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Solution for 21=10+m equation: 



21=10+m

We move all terms to the left:

21-(10+m)=0

We add all the numbers together, and all the variables

-(m+10)+21=0

We get rid of parentheses

-m-10+21=0

We add all the numbers together, and all the variables

-1m+11=0

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

-m=-11

m=-11/-1

m=+11

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