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2014-07-31T22:17:49-03:00
9ab+6b+12ac+8c
3b(3a+2)+4c(3a+2)
(3b+4c)(3a+2)

xy+x-ay-a
x(y+1)-a(y+1)
(x-a)(y+1)

pq²-q²r+pa-ar
q²(p-r)+a(p-r)
(q²+a)(p-r)

ax+x+a+1
x(a+1)+1(a+1)
(x+1)(a+1)

bx+cx+x+n+bn+cn
x(b+c+1)+n(b+c+1)
(x+n)(b+c+1)

9a-12+15a²-20a
3(3a-4)+5a(3a-4)
(3+5a)(3a-4)
3 5 3