Вынести общий множитель за скобки. Помогите пожалуйста.

3x + 3y = 3(x + y)5a - 5b = 5(a - b)7a + 7y = 7(a + y)8x - 8a = 8(x - a)3x + 6y = 3(x + 2y)5a - 20b = 5(a - 4b)7x + 14y = 7(x + 2y)8a - 16b = 8(a - 2b)8x + 12y = 4(2x + 3y)15x - 20z = 5(3x - 4z)21b + 49k = 7(3b + 7k)4c² + 12c⁷ = 4с²(1 + 3с⁵)8x³ - 24x² = 8x²(x - 3)y⁵ + 2y³ = y³(y² + 2)7c⁸ - 5c³ = c³(7c⁵ - 5)4z⁵ + 12z = 4z(z⁴ + 3)7a⁷ + 14a = 7a(a⁶ + 2)7ax + 7bx = 7x(a + b)3by - 6b = 3b(y - 2)3a + 9ab = 3a(1 + 3b)15y - 5y⁴ = 5y(3 - y³)8mn - 4m² = 4m(2n - m)x²y + xy² = xy(x + y)a³b⁴ + a⁴b³ = a³b³(b + a)

1.3(x+y)2.5(a-b)3.7(a+y)4.8(×-a)5.3(×+2y)6.5(a-4b)7.7(×+2y)8.8(a-2b)9.4(2×+3y)10.5(3×-4z)11.7(3b+7k)12.4c^2(1+3c^5)13.8x^2(x-3)14.y^3(y^2+2)15.c^3(7c^5-5)16.4z(z^4+4)17.7a(a^6+2)18.7x(a+b)19.3b(y-2)20.3а(1+3b)5y(3-y^3)4m(2n-m)xy(x+y)a^3b^3(b+a)