Answer:
g = 62/3 or
[tex]g = 20 \frac{2}{3} [/tex]
Step-by-step explanation:
[tex] - \frac{31}{3} = - \frac{1}{2} g \\ - \frac{31}{3} \times ( - 2) = g \\ \frac{62}{3} = g \\ g = \frac{62}{3} \\ g = 20 \frac{2}{3} [/tex]