Answer:
x=-4
Explanation:
1. Distribute
3(2x+8)=0
6x+24=0
2. Subtract 24 from both sides.
6x+24=0
6x+24-24=0-24
3. Simplify
6x=-24
4. Divide both sides of the equation by the same term
6x=-24
=

5. Simplify
x=-4
And thats the answer.
I hope this helps :)