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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