Answer: 
Step-by-step explanation:
To solve this exercise you need to remember the following properties:
1. The Distributive property states that:

2. The Addition property of Equality statest that:
If
, then 
3. The Subtraction property of Equality statest that:
If
, then 
4. The Division property of Equality statest that:
If
, then 
5. The Multiplication property of Equality statest that:
If
, then 
Given the equation:

You must solve for "g" in order to find its value:
- Apply the Distributive property:

- Apply the Addition property of Equality adding 30 to both sides of the equation:

- Apply the Division property of Equality dividing both sides by 2:
