Gấp lắm rồi ạ!! Nhanh nhất 5 sao và 1 lời cảm ơn ạ

1) 5x + 5y = 5(x + y)

2) x^3 + x^2 + x = x(x^2 + x + 1)

4) 15(x - 2) + 9y(2 - x) = -9xy + 15x - 30 + 18y = -9xy + 15x + 18y - 30

5) 2a + 2b = 2(a + b)

7) 2a + 4b - 6c = 2(a + 2b - 3c)

8) 3a - 6b + 9ac = 3(-2b + 3ac + a)

10) -2ax + 4bx = 2x(b - a)

11) -3xy - 3x^2y = -3xy(x + 1)

13) 10(x + y) - 5(x + y)y = (10 - 5y)(x + y)

15) x(y - 2014) - 3y(2014 - y) = -3y^2 + xy + 3y(2014)

16) a(x - 1) + b(x - 1) = (a + b)(x - 1)

17) x(y + 1) + 3(y + 1) = (y + 1)(x + 3)

18) ab(x - 5) - b(x - 1) = ab(x - 5) - b(x - 1) = b(-x - 5 + 1) = ab(x - 5) - b(x - 1) = ab(x - 5) - bx + b = (ab - b)(x - 5) + b - 5b = (b(a - 1))(x - 1)