2x2-6xy+2x
-15x2+8x
xy+2x+3y
-16x2y+2xy+32x
ab+a-2b-2
12ab-9a-16b+12
48x2-94x+45
a2-a-30
25x2+20xy-12y2
x2+2x+1
9x2+84x+196
y2-49c2
49m2-121n2
49y2-64x2
x2-y281
36x2-4
40x3+35x2-90x
4x2+25y2+20xy-16x-40y+16
12x3+55x2-27x-10
-2x2-9x-10
6x2-5x-24
5x2+8