First, we will combine like terms.
G-10+7g=15+3g
8g-10=15+3G
We will then move all constants (numbers without a variable) to the right side of the equation.
8g-10=15+3G
8g-10+10=15+10+3G
8g=25+3G
We will now move the variables to the left side of the equation.
8g=25+3G
8g-3G=25+3G-3
5g=25
We will now divide both sides by 5.
5g/5=25/5
G=5
5 is your final answer.
Hope this helps!