15=3+6a

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Solution for 15=3+6a equation: 



15=3+6a

We move all terms to the left:

15-(3+6a)=0

We add all the numbers together, and all the variables

-(6a+3)+15=0

We get rid of parentheses

-6a-3+15=0

We add all the numbers together, and all the variables

-6a+12=0

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

-6a=-12

a=-12/-6

a=+2

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