Determine the GCMF of each set of monomials.

7. gh⁷, g³h⁵
8. 12g²h, 28g⁵h³
9. 25km²n³, 15k²mn⁵, 30km
10. 3(p - r), 6(p - r), 12(p - r)
11. 18k²(b + 2), 45k(b + 2), 27k⁵
12. 50y⁴ (z + 2)³, 125(z + 2)⁷, 75(z + 2)⁵​