21=2a.a=3

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Solution for 21=2a.a=3 equation: 



21=2a.a=3

We move all terms to the left:

21-(2a.a)=0

We add all the numbers together, and all the variables

-(+2a.a)+21=0

We get rid of parentheses

-2a.a+21=0

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

-2a.a=-21

a=-21/1

a=-21

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