To solve this equation, you first need to get all the a's onto one side, because you want "a =", so you can add 2a
8 + 6a = -2a + 24
+ 2a
8 + 8a = 24
a is still not on its own yet, so we need to subtract 8 and then divide by 8:
8 + 8a = 24
- 8
8a = 16
÷ 8
a = 2
So your answer is a = 2, I hope this helps!