21=10+a

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Solution for 21=10+a equation: 



21=10+a

We move all terms to the left:

21-(10+a)=0

We add all the numbers together, and all the variables

-(a+10)+21=0

We get rid of parentheses

-a-10+21=0

We add all the numbers together, and all the variables

-1a+11=0

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

-a=-11

a=-11/-1

a=+11

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