7a=3+9a

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Solution for 7a=3+9a equation: 



7a=3+9a

We move all terms to the left:

7a-(3+9a)=0

We add all the numbers together, and all the variables

7a-(9a+3)=0

We get rid of parentheses

7a-9a-3=0

We add all the numbers together, and all the variables

-2a-3=0

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

-2a=3

a=3/-2

a=-1+1/2

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