21=4a+6+a

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Solution for 21=4a+6+a equation: 



21=4a+6+a

We move all terms to the left:

21-(4a+6+a)=0

We add all the numbers together, and all the variables

-(5a+6)+21=0

We get rid of parentheses

-5a-6+21=0

We add all the numbers together, and all the variables

-5a+15=0

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

-5a=-15

a=-15/-5

a=+3

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