20ax-5bx-2by+8ay
-180 + a^2 + 8a
49x^(2 ) + 16 - 56x
15a +a^2 + 56
a+ab+ax+bx
(4a-b)(5x+2y)
(a + 18) (a-10)
(7x - 4)2
(x+ ) (a+ )
17x + 8
(a+b)(a+x)