2a=a+21

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Solution for 2a=a+21 equation: 



2a=a+21

We move all terms to the left:

2a-(a+21)=0

We get rid of parentheses

2a-a-21=0

We add all the numbers together, and all the variables

a-21=0

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

a=21

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