1. 10а + 15b = 5*(2a+3b)
2. 2ab - 5b = b*(2a-5)
3. x^5 - x^4 = x^4*(x-1)
4. 2m^6 + 8m^3 = 2m^3*(m^3 - 4)
5. 3xy^2 + 6y = 3y(xy + 2)
6. 5bc^2 + bc = bc(5c + 1)
7. a^2b^2 - 4ab^3 + 6a^3b = ab*(ab - 4b^2 + 6a^2)
8. b(3 - x) - 4(3 - x) = (3 - x)(b - 4)
9. 5(a - b) + x(b - a) = (b - a)(5 + x)