21+a=2a

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Solution for 21+a=2a equation: 



21+a=2a

We move all terms to the left:

21+a-(2a)=0

We add all the numbers together, and all the variables

-1a+21=0

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

-a=-21

a=-21/-1

a=+21

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