21=6a+3

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Solution for 21=6a+3 equation: 



21=6a+3

We move all terms to the left:

21-(6a+3)=0

We get rid of parentheses

-6a-3+21=0

We add all the numbers together, and all the variables

-6a+18=0

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

-6a=-18

a=-18/-6

a=+3

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