1. Expand 20(a + bc)
2. Expand 4(3a + 6b)
3. Expand 7(2s + 3t)
4. Expand s(14 + t)
5. Expand 5a(1 + b + 5c)
6. Expand 10(s + t + u)
7. Expand 7(2ab + 4c + 11)
8. Expand 15a(1 + 2b + 3c)
back to: 
to: 
