3a+2b=8

\displaystyle a = 6b + 6 a=6b+6

First, let's write it like this:

Subtract  from both sides.


Divide both sides by 3.



Now that we know what's the value of , let's find the value of 

Let's take the first part.

Multiply the fractions.

Cancel the common factor, which is 3.

We would be left with.

Add like terms.

We would be left with.

Subtract 8 from both sides.



This tells us that  can be any number. 

Let me know if you need any help!
Thanks!
-TetraFish