x(x+1)
abc(1+c)
3(2a+5b)
a^2+ab
abc+abc^2
2ax(a+3x)
2p^2
18p^3+p^2
x^2+x
12xy^2 (2a^2-3xy^2)
6a+15b
24a^2 xy^2-36x^2 y^4
b(a-1)
ab-b
a(a+b)
2a^2 x+6ax^2
