A group of girls stood in three rows. The 1st row had 9z girls. The 2nd row had 7z more girls than the 1st row. The 3rd row had 5 less girls than the 2nd row.
- Find the number of girls in the 3rd row in terms of z. Give your answer in the simplest form.
- There were 43 girls in the 3rd row. Find the value of z.