Molly establishes a line of credit with a deposit of 1000 dollars. Two years later, she withdraws 300 dollars. Three years after that, she deposits 1600 dollars. Two years after that, she withdraws 550 dollars. Three years after that, she deposits 1700 dollars. Fifteen years after establishing the line of credit, she makes a withdrawal of 4500 dollars that closes the account. Let $i$ be the effective rate of interest. Set up an equation of value for this problem that would be used to solve for the possible effective rates of interest. Make the substitution $x=1+i$ to get an equation in the variable $x$. Fill in the missing portion of this equation below:
Answer: $= 4500$.