a=21-2a

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Solution for a=21-2a equation: 



a=21-2a

We move all terms to the left:

a-(21-2a)=0

We add all the numbers together, and all the variables

a-(-2a+21)=0

We get rid of parentheses

a+2a-21=0

We add all the numbers together, and all the variables

3a-21=0

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

3a=21

a=21/3

a=7

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