Divide into factors.

a) [[$ xy + 5y + 6x + 30 $]]



Answer: [[$ xy + 5y + 6x + 30 = $]]

b) [[$ xy - 4y + 6x - 24 $]]



Answer: [[$ xy - 4y + 6x - 24 = $]]

c) [[$ xy - 5x - 3y + 15 $]]



Answer: [[$ xy - 5x - 3y + 15 = $]]

d) [[$ 6x + 6y + 7x + 7y $]]



Answer: [[$ 6x + 6y + 7x + 7y = $]]