Please show the work on how to solve this, not in excel

You have just sold your house for $900,000 in cash. Your mortgage was originally a 30 -year mortgage with monthly payments and an initial balance of $750,000. The mortgage is currently exactly 181/2 years old, and you have just made a payment. If the interest rate on the mortgage is 7.75% (APR), how much cash will you have from the sale once you pay off the mortgage? (Note: Be careful not to round any intermediate steps less than six decimal places.) Cash that remains after payoff of mortgage is 9 (Round to the nearest dollar.)