All you have to do is simplify the equation, and then isolate g.
-5 + 7g = 3g + 9 add 5 to both sides to isolate 7g
7g = 3g + 14 subtract 3g from both sides to isolate g
4g = 14 divide both sides by 4 to isolate g
g = 3.5
The answer is D- 3[tex]\frac{1}{2}[/tex]
