Final answer:
To solve the equation 50 - 2g = 30, subtract 50 from both sides and then divide by -2 to solve for g. The missing value in the solution is 10.
Step-by-step explanation:
To solve the equation 50 - 2g = 30, you will need to isolate the variable, g. Start by subtracting 50 from both sides of the equation, which will give you -2g = -20. Next, divide both sides of the equation by -2 to solve for g. This will give you g = 10. Therefore, the missing value in the solution of the equation is 10.