He has $2 left because he has $5, which is taken away from $14 leaving him $9 in debt, $8 of his debt is forgotten so he's down to $1 in debt, after he pays off his last dollar, he will have only $2.
The answer would be 6x/5-16/5
10x + 9
because the -6x and positive 6x cancel out and all you have left is 2+2+5 and 10x